Ive had a 90 gallon aggressive system kicking for almost a year now with no problems at all. Its a fish only tank with just a couple triggers and a puffer. Wanting to do something different, i picked up a small 29 gallon, 20lbs of live rock, and 40lbs of live sand. Had it Kicking for a month and then dropped some mushrooms in it. Mushrooms where doing great, getting real big and it was going real good. Then the problem started. A blackish looking algae. started on the live sand about the size of a quater. I removed it by hand but it came back. Now its a big spot and im getting a little on my live rock. Its kinda hairy looking and now looks more purple then black. I have turbos, a few fighting conch snails, and hermits but they dont eat this crap. I want it out. Please help?!! It almost looks like mat algae