Ellenquacker72
Aquarium Advice Freak
I bought PFS for my new 20g, is it ok to use? I've heard lots of different things about it... Like it raises hardness by a lot ( my hardness is already really high! ) and that will create a large population of diatoms etc. But others people say that it is safe. I don't know! I don't want to hurt my fish after I upgrade to try and make their lives better!