I used rainwater barrels to build an aquaponic system , the tanks around 30 or 40 gallons, and has around 10-15 goldfish, I add some fishemulsion kelp, bat guano, bonemeal. For a more nutrient rich solution. Near by the tank is a worm bin that I add to the water time to time. The plants I have not grown huge, but smell and look great. I think part of the problem is water temperature(growing in night time temps of 35-55) in greenhouse, lack of light , nutrient ppm, and potentially PH monitoring. Any suggestions?

YouTube - aquaponics