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I experienced it with my last tank. One way I found that works to resolve it is to place a power head upside down with the suction side an inch or so under the surface. The water drains from the surface, rather than through the bottom of the tank. It works pretty well, but be careful to place...

It sounds to me more like the fish are being attacked by something, rather than any disease i am familiar with. Are there and inverts, corals, crabs, worms etc.. in the tank?