aaahhhh, the joys of nuisance algae. I'm no expert but I've fought & won a few battles over the years so I tell ya what I know.
No single one thing works to stop it. It's a combo of & then maintaining them faithfully (aka: the hard part).
-increase your flow
-reassess the # of waste producers in the tank, overstocked?
-how much are you feeding?
-do you have a healthy population of detrivores?
-are your nitrates out of control?
-up your water changes.
-are your phosphates out of control?
I embrace a hybrid approach to reefkeeping, I utilize as many natural ways of waste elimination as possible, but I also liberally utilize resins, carbon, & skimming to back things up. I have found my tank just looks better & my corals do better & reproduce when I get off my butt & hit it from all angles.
Remember light+nitrates+phosphates=pea soup.
I am very pleased with Sea Chem products & actively /continuously use Denitrate, Phosgard, Purigen & carbon in my tank. I skim 24/7 with a beckett modified ETSS reefdevil down draft on a mag 12. I feed heavily & try to keep my detrivores happy & well populated. I have kicked the !@#$ out of a year & a half long battle with Bryopsis & hair algae using this method. I am now algae free times six months. KNOCKING ON WOOD AS I TYPE!
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