I am almost certain I am dealing with a bacterial bloom and its driving me bonkers. My skimmer is like a work horse taking so much sludge out but it is not helping, So I did a 35% water change and put my canister filter back on with coarse sponge, then purigen, and finally fine floss. Within a few days tank was great now its going back to cloudy water. I checked and cleaned the canister and purigen is still the same color as when I added it with a little brown in it so I don't think it needs changed yet. How can I make it stop? I feed several small meals a day and watch to make sure everything is eaten. Checked to see if maybe some snail died and is rotting. I can't seem to figure this out. All the fish and shrimp are doing fine. water just looks bad.