I have had hair algae for a while now, maybe 6-8 months, and I can't seem to get rid of it or find what is causing it. I have tried many things like NoPox, microbacter 7, flux rx (3x dose), Mexican turbos (at one point I had 15), emerald crabs, sea hare, lower light length and intensity, complete deep clean of all rocks, and a week-long black out, along with regular water changes. So far I have had not even a little success, besides the deep clean but the algae is back now. I have heard that it could be from nitrates and phosphates but for the past 4 months or so my nitrates have been stable at 10-20 and phos at .03-.15. My tank is about 3-4 years old and I did go through a phase of no problems for 2 years then started to experience some hair algae. Not really sure what else to do, any ideas?