Ok so i recently posted a thread with pics regarding nuisance algae in my tank- green and red dust algae on the glass. So yesterday I go down to feed my fish and along the rim of the tank at the surface water I have F&$@ing green hair algae growing!!! WTF!? I thought in a cycled mature tank this won't happen? I'm doing everything right... My own RO water, water changes, p skimmer, cheato in sump lots of live rock... Yet I'm getting algae everywhere again. Why us this happening? I'm going to test my water tonight again. Last time I did it my phos reading was so little it appeared to be 0, my ammonia is always around .25 and nitrates usually between 10 and 15 even with a skimmer... So what am I doing wrong?