Sorry for the second post but I think I may have jumped too conclusions and with my ignorance on the subject I would like to keep this as unbiased as possible. As I said in my last post, this past week I've been observing my tank with a clown, bicolor blenny, and purple tang with crabs and snails also... I first noticed a tiny white spot on the CB so have been monitoring the tank closely. A couple days ago I came to the conclusion the white spots were just tiny grains of substrate because they never lasted more then a day. well today my clowns swimming erratically and has a white film on his side (not the tiny white specs I've been monitoring ) but a large white film almost.