07-27-2010, 11:20 AM
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Without seeing it I really can't suggest what it might be. It is not very likely to be fungus, that would grow in patches.
I suspect the water changes have solved the other issue. I used one of these products once in the past, and when I saw the reaction of the fish I realized it was causing them difficulty, so I did a major water change. Then subsequent research showed me how foolish I had been in using such a product.
Sadly, not everything even reputable aquarium manufacturers produce is without risk and some of it, like clarifiers, really do not belong in an aquarium. Algae and snail killers are another two; these chemicals can do far more harm to the fish, plants and biological system, while seldom really solving the initial problems anyway. Then there are so-called "sludge removers" and such; the claims they make to replace water changes and the like are really from another planet. My maxim now is that no chemicals or products enter the aquarium unless it is something that is absolutely crucial to the health of the fish, or is absolutely essential to the plants (like liquid fertilizer). Aquarists sometimes forget that fish are confined to the relatively small volume of water and cannot escape whatever goes into the tank.