Hi! Haven't talked to you in a while. I have fish dying! I changed the Aqua Clear sponge filter and siphoned off empty snail shells about 2 weeks ago. Now the tank is cloudy and my bronze cory catfish are dying (#4 today). I know it is a bacteria bloom. I have changed the water several times or twice a week. The tank is so cloudy you cannot see through it. Fish keep coming to the top of the water for air--they aren't look too good. Usually water changes helps but this time it is not. Can you tell me what to do...or what not to do?