I have a 54 Gal corner tank running for about three months. 60 lbs of live rock, various hermits, emerald crab, fish and LPS. I do a 25% water change every two weeks. Use RO water, carbon,GFO in a reactor, uv, sump with macro algae and 1000ss skimmer. LED lighting 8 hrs a day. I clean my filter sock every 3 days. Phosphates 0 nitrates 5-7. I thought I was doing everything right but have lots of green and brown stringy algae. I try to siphon out what I can when doing water changes but it just comes back stronger. Some of the stringy stiff is 8 to 10" long at times. I cant keep snails the hermits just kill them. Any ideas?