I've had a couple of small outbreaks on one part of my sand bed and on 2 rocks. what worked run carbon i've been running at minumum 1 Lb. added a couple of ocilating power heads this helped. I have also added a tuxedo urchin he eats every thing but has not gone on the rocks that I want him to as I have 3 rocks that have Hair algae on. I have a shortened light on time from most others this helps for alot of thing.
My fish pick at it but not much so once a month I pluck and I get quite a bit of the root matter, it will not grow back if you can get the root matter out also. I think the urchin is prity cool cleans the rock better than the sea hare I borrowed, the urchin takes it right down to rock no green tint left as compared to the sea hare. In a couple of months I maybe able to get ride of mast of the hermit crabs I will probably keep a couple of the smaller ones.

Bill