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How can fish provide all the nutrients required for plants in an aquaponic environment? This is not the normal case when organic fertilizers are used in a non-aquatic environment.
Potassium, calcium, and iron are commonly low in aquaponics.
You can add potassium sulfate but check your pH before adding to make sure you actually need it. Add in small amounts and monitor the pH levels.
Aragonite is a natural calcium carbonate. It can be purchased online or in bags at most decent aquarium shops. It comes in chip form and can be easily added to the growing medium for slow dissolving/release. It will disintegrate over time and need to be replenished. Again - Monitor pH.
Iron can be added in a liquid form. It occurs naturally in streams, etc from access to minerals. The leaves will yellow without it. AquaIron is one product. Check you water to make sure you don't overdo it. Iron checkers are less than $50 or you can have your water tested.
Follow the dosing directions and all will be safe for the fish.
Truth is, it is difficult to maintain a healthy plant in a fish aquarium.
In ponds and streams, nutrients are washed down into the water with rain run-off.
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