Ok knowledge gang! I have an algae been fighting for about 3 weeks now and after researching my butt off, still not sure what it is. Using RODI 4 stage (just changed), have a recent ATS (Turbo Aquatics) addition that is just starting to get some growth, use TM pro salt, frequent water changes 20% a week, have a few turbo/nassarius snails and hermit crabs, Phosphates on point 0.03 but Nitrates are high at 19 (although have been coming down and was over 30 2 weeks ago). Been keeping the lights down at 25%Blue/10% white for only 7 hrs a day for a few weeks now. 3 tangs and a few other fish in tank that get 2 cubes and a turn on the AFS each day. Have filter socks changed every 2 to 3 days and still this algae is hanging in. Rocks are almost perfectly clean but sand bed is a mess. It does not "blow away" or disappear when lights are out and really is not easy to siphon from sand. Soooo any ideas on what it is and what I can do?
n do? Brown reddish and