Ok, never fun. I was going to point you to a great write up my Myka, but couldn't find the thread anymore.
Anyway I battled it for 2 years (ask Kelly & I think you saw my tank there once). I am finally getting it under control, but there is still some battle.
First thing to do is deal with the source of the problem, usually phosphates. Test your water & post results here. The algae will prob help the test to show zero, that doesn't mean there is none. Are you using RODI water? From a store or your own unit?
Next, flow, got enough? How often are you changing water? (When mine was really bad I was doing 2 10 gallon changes twice a week while scrubbing rock)
Lighting, what type & when were bulbs last changed? How long is your lighting period?
Stocking, what is in the tank? everything accounted for?(no missing fish or large creatures?)
Also get a phosban reactor & use it. Got a sump? (If I remember right you do) get cheato in it.
Thats what I can think about right now. I am sure someone else will chime in.
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