How to diy an aquaponic filter cheap for bigger fish. first, do not leave the standard fish tank filter in the tank! what you need: a pump. use a pump the is rated to lift the height raise between the bottom of the tank and the top of the filter. use a ½ feed line from the pump to the filter. i find ½ allows a good rate of water flow.. Aquaponics fish tank work by taking ammonia-filled water from the fish tank created from fish waste to water the plants on top of this fish tank. the plants take the ammonia-laden water, filter it as fertilizer so return the water to the tank as fresh as if you used an everyday aquarium filter.. Diy aquaponics can be fun, if you have the time (and patience) for planning out a system, piecing together the setup from different suppliers and assembling things yourself. (if you’re up for that, you might want to check out this guide on how to make a diy aquaponic fish tank filter.).
