Hi all, Iam experiencing some problems with 2 of my bluegills/sunfish. I have a 40 gal tank with 2 bluegills,1bala shark,ploco algae eater,and a albino catfish. Live plants i put in because of high nitrates. I have the aqueon 50/75 filter system. I had bought a fish koi goldfish and another placo.fish from a store i wont mention. Well in a short time my 2 bluegills have gooten sich with grayish whitish film on the .They dont eat and are very lathargic. I believe the little one iam going to lose.He is at the bottom barely moving. Ive been using rid-ich and doing daily water changes. Sunday a 80 percent change today a 40. I also bought prime. and put that in after i change water. I dont know what else to do. I have aquaium salt to help aid in healing dont know if i should use that too. Can anyone give me adice as what to do? Keep doing what Iam.I think the big bluegill looks like it has changed on his body but still doesnt move much or eat.