I have tanks filled with water rich in fish/frog waste, I've heard it could be a good fertilizer if you use it to water your plants. Has anyone experimented with this?
a good stable well established fish tank have a good abundance of nutrients. I do 10 gallon water changes every couple weeks on my 125 gallon tank. It has yet to hurt the plants.
I have 9 fish tanks breeding red claw crays and Australian native catfish always recycled the water and used on my out door plants,they loved it along with miracle grow fertilizer. The only dative I use is the wardleys freshwater plant food.