Just venting...I know all of the advice: low nitrates, low phosphates, control lighting, use a soft toothbrush, good water circulation with no dead areas, it will go away on it's own, protein skimmer, etc. etc, etc. Done all of that... Nitrites - 0, nitrates - 0, Phosphates - 0, use RO/DI water only, light on 7 hrs/day, 6.5 watts/gallon, algae scrubbed every 2 weeks, rotating powerhead plus two power filters with total capacity of around 250 gph, water changes + protein skimming, no direct or indirect sunlight, tank up for 10 months, careful not to overfeed...cannot have any kind of blennie (10 gal tank with my good friend Lil' B (Little B*st*rd, my yellowtail damsel, who would not allow a blennie to invade his tank). I added my modified Skilter 250 a month ago (see my post under Protein Skimmers) and it is removing tons of stuff... ARGHHHH!!!!! Cant get rid of the crappy green hair algae!!!! The &@#*^@$ stuff grows like a weed (which it is). It's terribly frustrating and makes me want to take everything out and chuck it! Sorry for the rant...again, I know all of the advice, and am following all of it. I don't expect a magic solution to be suggested here... just venting. I wish I could use the real words instead of using the stars, ampersands and other symbols, but you might guess what words they stand for (not nice)! $#^&$@*&^$#*&^**$!!!!!!