I have gha growing but only on the back panel of the tank. I have been siphoning the algae out and scraping with razor blade. I have done a 3 day black out and that seemed to help. Tank is a 75 gallon. Only 2 fish. 1 yellow tang and 1 purple firefish. Not much clean up crew. I have 1 red leg hermit crab and 1 blue leg. 1 tiny pointed shell snail, and green sea cucumber. Also have a brittle star ,and sand sifting star. My Rodi membrane and di resin probably need replacing. I have a 6x54 t5 ho with new ATI bulbs. Sump has super reef octopus 1000sss skimmer. Fuge has chaeto. I really want this cleaned up. I have ran out of ideas. I'm willing to add fish and or add to clean up crew. Even consider a sea hare or an urchin. Any advice or ideas would be greatly appreciated. I also have frogapawn, hammer, goniporia, zoa frags, birdsnest frag and a sea fan. Cabbage coral and couple leathers.