Okay I'll do that. but I could get rid of the air stone I have in there now right? It's just the regular filtration system that came with the tank. It's a 55 gallon tank that I bought at PetSmart 7 years ago. Here's the thing, this gold fish was won at a carnival 9 years maybe even 10 years ago. I had a 1 1/2 gallon tank with a snail in it and just put him in there cause normally they don't live that long, then I ended up with a 10 gallon and now a 55 gallon. I know nothing about fish tanks but I really love them and would like to continue, but I have no idea what I'm doing. lol This poor fish has been through all kinds of illnesses, parasites and has survived, now I'm trying to keep some type of mold from growing in the tank and I'm just frustrated. But I would like a different type of filter in it.