So I look in the tank this afternoon, and sure enough, I see it STARTING. A litte purple fuzzy tint to the sand. So, I syphoned it all out along w/ the sand that it was covering, don't worry, there's still about 2 inches of sand left. I replaced about 1/3 of the water. Then, the pump on my crap filter stops working, so I throw on one of my Emporer 400's from the FW tank, after washing it of coarse. Hopefully, this nipped it in the bud. IF NOT, please let me know the best way to kill this stuff before it gets worse, w/out hurting anything else inthe tank of course. THANK YOU!!