Scott
i would be inclined to say you have a nutrient issue. You can buy all the critters you want to eat the stuff but it will just come back. And the eaters gotta poop. there for, the nutrients are still there. I definately think you need to remove as much algae as possible. The key word there being "remove" It has to leave your system like was said above, syphon as much as you can out. You said it seems to be receeding, What have you done to cause this, I,e. changed R.O filters, DI cartriges etc. From my experience hair algae will look like crap (brown and not healthy) if you have found and removed the source of the nutrients. and if it is dwindling this is a good time for mowers (snails)
You have some nice looking corals there. Its hard to find SPS down here in LA,,,,,,,that would be Lower Alabama (Northwest Florida) but i have found a couple of good shops but still quite a drive.
Ps, is that MARCO rock you have in there?
thanks again for the bulb info!!
Adam