I have recently developed filamentous algae - commonly called hair algae. It is spreading a bit and I need to try to control before it gets out of control. I have hermit crabs, sea cucumbers, starfish(s), sea urchin, emerald crab, lawn mower (rock) blenny and nothing seems to eat this stuff.
Water parameters are almost perfect. Phosphate is not high and I even placed phosban in the sump, just in case.
I was adding Iron, but someone told me to stop, since that could be causing the hair algae to grow...? Any ideas?