How Do You Maintain An Aquaponics system?

How do you maintain an aquaponics system?

Set Up

Setting up an aquaponics system requires a mix of expertise and thoughtful planning. You need to choose the right size of the tank and the related components for your particular system. You also need to select and place the appropriate fish and plants, as well as determine the optimal water flow in your aquaponics system. Also checkout more about maintaining aquaponics.

Let’s look closely at the steps to consider when setting up an aquaponics system:

  • Choose the right size of the tank and the related components for your particular system.
  • Select and place the appropriate fish and plants.
  • Determine the optimal water flow in your aquaponics system.

Choose the right tank size

When you’re setting up an aquaponics system, one of the most important decisions you will make is choosing the right tank size. You need to take into account factors such as fish species, amount of water needed, and the type of plants you will be growing. You also want to consider future expansion and the level of maintenance that is appropriate for your system. If you choose a tank that is too small, you may restrict your growth opportunities or find that your fish are overcrowded and underfed.

To choose the right sized tank for your aquaponic system, it’s best to start by considering these points:

  • The type and number of aquatic animals: Different species may require different sized tanks due to their size, temperament and water requirements.
  • Surface area needed for plant growth: Depending on what kind of plants you are growing, their light requirements and growth rates should be taken into consideration when calculating tank size.
  • Water capacity needed for filtration: A larger volume of water allows for more effective biofiltration with fewer chemicals because it provides bacteria more opportunity to grow in the system.
  • Amount of space available: How much available room do you have to house this setup? This is critical as larger systems can take up quite a bit of space in comparison to smaller ones.

Aquaponic systems come in all sizes—from small desktop models to large commercial setups—and no one setup fits all applications but by keeping these points in mind when selecting a tank size, your chances at success increase dramatically.

Decide on the type of fish

When selecting which type of fish to use in your aquaponics system, it’s important to consider their growth rate, temperature requirements and preferences for water type. Fast-growing fish like tilapia are popular choices, as they can provide not only food but also fertilizer that is high in nitrogen. Other suitable species may include crappie, bass and koi.

For both the fish and the plants, it’s best to choose varieties that can adapt well to the same environment. Before you select your species, take into account if you will be able to keep up with their necessary maintenance requirements – fluctuating temperatures or pH levels could be a problem if you’re not able to consistently monitor them. Additionally, be mindful of local laws when choosing a breed; some countries prohibit certain species from being kept or introduced into ecosystems.

Select the right plants

Choosing the right plants is integral to getting the most out of your aquaponic system. There are a few broad considerations to bear in mind when selecting plants, including growth rate and size as well as preference for either wet or dryer conditions.

  • Growth rate: In aquaponics, fast-growing plants with quick turnaround times work best since the nutrient-dense water will give them an extra boost of energy. Be sure to select plants that are suitable for harvesting in short time frames.
  • Size: The space available for your system should also influence your selection; if you don’t have a lot of room for large, sprawling plants, you may prefer ones more compact and upright in growth pattern.
  • Wet or dry conditions: Some plants prefer being submerged in water while others tend to dry conditions closer to the surface. Inspect each variety you are considering and take note if they grow better with more or less water exposure.

Common examples: There is a wide range of plant species that can be used in aquaponics systems—popular choices include lettuce, tomatoes, basil, oregano and many other herbs; strawberries, arugula and zucchini; as well as cabbage and cauliflower.

Water Quality

Maintaining water quality is a key element of an aquaponics system as it not only supports the fish, but also the plants. You should monitor and test your water regularly to ensure that your water is at optimal levels for both the fish and the plants.

Different types of tests should be ran in order to properly monitor the water quality. Additionally, the water should be changed periodically to prevent the build-up of toxins and nutrients.

Monitor pH levels

Monitoring pH levels is important in an aquaponics system to ensure healthy water quality. The pH level is a measure of the acidity or alkalinity of the water, and it’s best to keep the levels in your aquaponics system within a range of 6.5 – 8.0, depending on the types of plants and fish you’re growing. Anything much lower or higher than these numbers can cause stress for both plants and fish.

Different species require slightly different optimal ranges for optimal health and growth, so it’s important to research what range each species needs before setting up your system; many sites sell test kits that will help you accurately measure your pH levels as well as other parameters such as ammonia or nitrates/nitrites.

You can also introduce biological agents that help stabilize pH levels over time, including beneficial bacteria and algae which thrive in some higher pH environments (up to 8.5).

Regularly monitoring your water parameters helps to ensure that everything is balanced in your system, allowing for the plants and fish to stay healthy and grow optimally. Changing water periodically can also help with this, particularly if there have been any significant changes such as additional fish added or significant plant die-off/growth – these all affect the chemistry of your tank which requires rebalancing via new water being added over time, or special chemicals/enzymes being introduced directly into the system to balance it out again.

Test for ammonia and nitrite levels

Regularly testing the water quality is one of the most important steps in maintaining a healthy aquaponics system. To ensure your fish stay healthy, you should test for ammonia, nitrite and nitrate levels on a weekly basis.

Ammonia and nitrite are toxic to fish, so it’s important to ensure the levels are low in your tank. Ammonia is released from all sources – fish waste, leftover food and decaying matter – while nitrite is produced when ammonia increases in a tank. When these two elements accumulate to high levels, it can lead to diseases and even death for your fish.

You can purchase test kits from pet stores or online which will allow you to measure the water’s pH level as well as the levels of ammonia and nitrite. Make sure to follow instructions carefully when testing your water. It’s also worth noting that both course tests (such as strips) and liquid tests (using a dropper bottle) are available places like pet stores or online retailers; whatever is easiest for you to use will suffice!

If any of these tests show higher than normal readings then it’s important take immediate action – adjust feeding habits, increase filtration or perform partial water changes – so that your aquaponics system remains safe and healthy for all its inhabitants!

Check for nitrate levels

Once your aquaponics system has been established and is running smoothly, it’s time to do some maintenance and make sure the water quality is up to standard. One important thing to consider when assessing water quality in an aquaponics system is nitrate levels. This can be done using a simple nitrate-monitoring test kit that tests for the presence of nitrates within the water supply.

Nitrates can originate from wastewater, fertilizers, and pond management. If the water has excess levels of nitrogen in it, it can be toxic to fish or plants growing in the system. To reduce nitrate levels in an aquaponic system, you will need to regularly replace the water with clean freshwater. This Dilution System introduces free Nitrates into the ecosystem. If you don’t replace your freshwater often enough, then your nitrate levels will start to accumulate in your aquaponics system leading to plant malnourishment and poor fish health.

Therefore, maintenance of your aquaponics system includes testing for nitrate buildup regularly either by visiting a laboratory or using a home test kit available at most aquarium or pet stores. Utilizing this precautionary measure ensures that you are preventing further growth of toxic nitrogen compounds that could harm fish as well as plants growing in your system over time.


Maintaining an aquaponics system is vital to the health of your system and the success of your crops. Regular maintenance will help ensure that your system is in optimal working order. In order to maintain a healthy aquaponics system, you must monitor parameters like temperature, pH, oxygen levels, and nutrients.

You must also check the water quality, inspect the pumps and other equipment, and perform regular maintenance tasks like cleaning and replacing parts. Let’s take a closer look at the specifics of maintaining an aquaponics system:

Clean and maintain the fish tank

The first step to properly maintaining an aquaponics system is keeping your fish tank clean. The tanks should be monitored regularly to ensure that ammonia, nitrite, and nitrate levels are kept in balance, as these three components heavily influence the health of the fish and plants in the system. Regular water changes must also be conducted to keep toxic levels down and maintain a healthy environment for both the fish and plants.

As part of regular maintenance, you should take steps to prevent your fish tank from getting clogged with organic matter or sludge buildup. Ideally, this organic matter should fall directly into the filtration system where it can be removed or broken down before it builds up in the tank. To aid this process use a robust filter that’s able to remove small particles quickly and effectively before they build up.

Additionally, conduct regular cleaning of equipment used in tanks such as de-nitrification beds, bio-filters, pumps, paddles or air stones. All of these items become easily clogged over time leaving them ineffective if not cleaned regularly – each needing a specific cleaning approach depending on its make and function.

Change the water regularly

An aquaponics system converts fish waste into nutrients that can be used to nourish hydroponically grown plants. To keep the system in balance, you need to regularly change the water and adjust possible water parameters. Changing the water will replenish essential minerals and oxygen while removing any excess of nutrient concentrations that could become dangerous to your fish if left unattended.

When performing a water change, start by using a siphon or other device to remove 10%-30% of the water in your tank. This amount will depend on your tank size and the number of fish in it, but it should not exceed 20%-30% for a single instance per month as sudden changes in water chemistry could prove damaging to your fishes’ health.

Once you’re done emptying out a part of the tank, make sure you also clean out any debris or particles stuck at the bottom along with any dead leaves or branches that may be blocking light from reaching deeper parts of the aquarium. After you’ve completed these tasks, you can refill your tank with clean, dechlorinated water at room temperature. Make sure to add it slowly so as not to disturb the carefully balanced ecosystem already present in your aquaponics setup.

How do you maintain an aquaponics system?

It is recommended that for an average-sized home aquaponics setup (50-200 gallons), you ideally perform a 10-15 percent change once every two weeks; this will ensure optimal life-support conditions for both plants and fish alike. Keeping an eye on parameters such as dissolved oxygen levels and pH levels will also help determine when it’s time for another scheduled water change session.

Prune and trim plants

Pruning and trimming the plants in an aquaponics system is essential to its health and overall balance. Pruning is important so that the nutrient supply from the fish’s waste can reach all of the plant’s roots efficiently. When pruning, avoid using scissors as this can damage the plant, instead use your hands or pruners for a clean cut. As with any gardening, trim off any dead leaves or branches but don’t remove too much at once as it could be detrimental to the plants health.

It is best to trim and prune while plants are still young so they take shape properly and not just sprawl out over each other stealing resources. By regularly pruning you will also be training certain parts of a plant like vines or stems eliminating problems such as shading other plants by redirecting growth away from already established areas within your garden. Prune once every 6-8 weeks depending on how quickly your plants are growing.


Feeding is an essential part of any aquaponics system. It is important to ensure that the fish are getting enough food to survive and thrive. This will help to keep the water clean and the fish healthy. Additionally, the fish waste will provide essential nutrients for the plants in the system.

Let’s take a look at how to feed an aquaponics system properly:

Feed the fish the right amount

The amount of food you give your fish should depend on the type of fish and the population in your system. Most fish require between 2-6% of their body weight everyday to remain healthy and provide adequate nutrients to the plants. Fish should be fed small amounts at regular intervals throughout each day to ensure that they consume the entire ration. It is important not to overfeed your fish as this can cause an imbalance in your system and lead to water quality problems due to excessive nutrients being available for uptake by bacteria or algae.

When first starting out, it is best practice to:

  • observe the fish for a few days before adding feed, as well as taking into account any additional food sources such as plankton or insects which may already be present in the water.
  • if feed is necessary for their sustained health, then it should only be added once a day or according to instructions from the supplier.
  • the amount of feed should also be regularly monitored and adjusted if needed, so that no more than 2-6% of body weight is consumed per day by each individual fish.
  • the feeding rate can increase with warmer water temperatures or extra light intensity, while lower temperatures and lower light levels reduce fish growth rate and require smaller feeding rates.

Feed the plants with organic fertilizer

Organic fertilizer is the key to a successful aquaponic system. Organic fertilizers are derived from natural sources and provide essential minerals, including nitrogen, phosphorus, magnesium and trace elements to your plants. When using organic fertilizers, it is important to choose the right type for your plants’ needs.

The two types of organic fertilizers commonly used in aquaponics systems are liquid and solid fertilizers. Liquid fertilizers are applied directly to the water source in established systems, while solid fertilizers are mixed into the hydroponic grow bed media or added directly on top of the grow bed. The best type of fertilizer for your particular system depends on what kind of plants you’re growing, as well as their specific nutrient requirements.

When adding organic fertilizer to an aquaponics system, it’s critical that you never exceed the recommended dosage on the package label. Excessive amounts of organic fertilizer can be toxic to both fish and plants; it can also encourage rapid plant growth at the cost of otherwise desirable properties such as flavor or texture. It’s generally best to begin with a small amount and then gradually increase it over time if needed. After applying fertilizer, test the pH levels of your water throughout your system regularly to ensure that they don’t become too acidic or alkaline for healthy plant growth; if needed, adjust accordingly with buffering agents such as crushed corals or dolomite lime.

Add beneficial bacteria to the system

Adding beneficial bacteria to an aquaponics system is essential for a healthy and productive system. The bacteria help maintain water quality and promote plant growth. Without these bacteria, the water quality would rapidly decline, making it virtually impossible for fish or plants to survive.

Beneficial bacteria generally exist in all natural bodies of freshwater and once introduced into an aquaponic system, multiply quickly as long as there is sufficient food available in the form of decaying organic matter and ammonia produced by fish waste.

Without a regular supply of nitrogen-based fertilizer, the growth of beneficial bacteria will be inhibited and algae may take over the system instead.

In order to maintain optimal levels of beneficial bacteria in your system, you need to ensure that there is a continual flow of oxygenated water from the source reservoir into your aquaponic tanks or swales. This helps disperse nutrients throughout your system which provides an ideal environment for beneficial bacteria to proliferate.

Additionally, make sure you have plenty of surface area for beneficial bacterial colonies to form on. You can increase this surface area by adding rocks, pebbles or bricks around the tank walls or substrate flooring – anything that offers structural complexity allows more areas for bacteria to colonize on so they can effectively perform filtration duties within your aquaponic setup.


Aquaponics systems require a lot of maintenance and it can be difficult to keep track of the many factors that can affect its performance. Fortunately, there are a few steps that you can take to troubleshoot any problems that you may encounter.

This section will cover all of the different ways that you can troubleshoot your aquaponics system:

Monitor for signs of disease

Disease can quickly devastate a thriving aquaponics system. As with any aquatic environment, populations of bacteria create a balance in the tanks, and any disturbance to this balance may result in visible signs of disease or illness. As the guardian of your aquaponics system, it’s your job to keep an eye out for signs of disease so it can be addressed immediately.

Signs of possible disease include:

  • Changes in fish behavior
  • Discoloration on fish skin or fins
  • Increased mucus production from skin and gills
  • Overgrown eyes
  • Increase in mold growth on plant surfaces due to excess nutrient levels from fish waste
  • Bacterial blooms that manifest as cloudy water conditions

To ward off diseases caused by bacterial imbalance, maintain correct water pH levels and filter nitrogen-rich water for excessive organic matter buildup that induces nitrification processes in the tanks. Underlying imbalances in chemistry and biology are often present before obvious signs of fish illness appear, so regular testing should always be done to monitor chemical parameters such as ammonia levels through a process known as aquaponics monitoring. The results will indicate whether chemical treatments such as adding activated carbon is needed or whether more drastic measures are required. Additionally, maintaining proper temperatures can also help reduce stress on your fish which reduces their risk of developing diseases due to weakened immune systems.

Identify and address nutrient deficiencies

In aquaponics systems, nutrient imbalances often result in deficiencies in essential elements such as iron, calcium, magnesium, and phosphorous. These deficiencies can cause rapid plant growth loss as well as produce poor-quality or bitter tasting fruits or vegetables.

To identify and address nutrient problems, it is important to take multiple readings of the system.

The three primary methods for doing so are:

  • test the water with a chemical test kit that measures pH, ammonia levels and nitrate levels;
  • check roots for visible signs of deficiency; and
  • measure specific nutrients such as iron, calcium and magnesium using soil testers or petri dishes.

Once any deficiencies have been identified, the next step is to correct them by supplementing with a quality soluble fertilizer designed for aquaponics or providing additional minerals in an accessible form that plants can utilize. Additionally, water changes can help improve nutrient levels if done regularly every two weeks or more often depending on the species of fish producing waste being used. Lastly, adjusting pH levels will also help increase uptake of essential nutrients by plants.

Check for pests and predators

Lack of maintenance is one of the main causes of failure in aquaponic systems. An important step in proper maintenance is regularly checking for pests and predators that can damage the system. These include, but are not limited to, aquatic life such as fish, shrimp and snails; common garden pests like earwigs, aphids and ants; as well as predators like larger fish, snakes or birds.

Inspect the water and plants on a regular basis for signs of pests or predators. Consider adding weather-proof barriers or nets around open areas to prevent large predators from entering. If pests are identified early enough, they can usually be removed or treated with available remedies. Be sure to check your plants for any signs of diseases which could have been brought on by an infestation – if these signs are present then contact an expert for help diagnosing and treating the problem.

If biofilters become clogged by organic matter, use a high-pressure hose to give them a good clean. This will ensure that the biofilter continues functioning properly and provides a healthy habitat for beneficial bacteria which will maintain water quality in the system. Regularly check pumps and other equipment used in aquaponics systems to make sure they are working properly; this may require taking them apart periodically to look for any issues that need fixing or replacing parts that may have worn out over time due to usage.

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