[Qwertus]

Some of the multi-vitamins have most of the macronutrients that plants need so I'm thinking of trying that in one of my tank. Does those have any negative effects on fish?

Also, which ingredient is toxic to fish?

 

[Qwertus]

I'm just curious, wanted to try something out of the ordinary. If those tablets got crushed into powder form then disolve in water, I think plants can use them. I'm just wondering how those would effect fish/invert.