Hi, we bought a Kole for the hair algea problem we have in our reef and our F/O, he will eat it off the glass, but doesn't really touch it on the rocks, then we bought 2 lawnmower blennys , same thing, they eat it off the glass like crazy but not off the rocks.
Heres something we heard from someone with a large F/O, if you keep your water temp at 77-78 degrees, the hair algea will die and you won't have anymore of a problem with it. We are tring this right now, just added chillers to both tanks, I know the reef can't be kept that low, but the F/O can be, will let you know how it works...Lisa