About three weeks ago I set up a 55 gal tank for a coral reef. It sat for about a month with live sand, and an Emperor 4008 filter, oh and a powerhead. Last week I put a wet/dry filter with a skimmer on it to replace the Emperor, and I also moved the fish and live rock from I had from a 40 gal tank I have had up for about three years. The fish and all seem to be doing fine except I noticed after a couple of days after putting the rock in that I had allot of bubbles in the tank so I shut off the powerhead but It's getting worse. The bubbles burst and it turns into this green slime, which is now on my rock and sand. How do I get rid of this horrible looking slime? :?