Hi everyone. I'm experiencing some green hair algae outbreak in my tank. The tanks been up for 2 years with occasional cyano/diatom outbreaks but this is the first time for the hair algae. It's a 20 gallon high, so 16" tall and I have 2 Par30 LED's that are about 3" above the top rim of the tank. The lights run 8 hours a day and the corals seem to like it. Parameters are 0-0-0 and I don't have means of testing for phosphates but I do run Chemipure elite which contains GFO. I tried manually removing the hair algae but it just keeps growing back because I can't get rid of it completely. Any suggestions? Or would a Lawnmower blenny be a good way of controlling it? Current livestock is 2 clowns, 2 peppermint shrimp, 1 cleaner shrimp, 1 watchman goby and pistol shrimp. Thank you! Also I use RO water that I buy from the machine down at the local Stater Bros.