[Reefmack]

Is it hair algae or Bryopsis? My lawnmower blenny never eats either. I had a sea hare once that seemed to eat every algae and even cyano, but they don't live long. After 8 months with no algae problems I started getting Bryopsis growth and it was starting to overgrow some of my corals. There's a thread in here on using elevated magnesium to kill Bryopsis. I tried it and it helped, but the biggest cure was getting a Foxface - no more Bryopsis. See if it's hair algae or Bryopsis that you have - I doubt most lfs know the difference. Bryopsis looks similar but they're not identical, and what may take care of or eat hair algae may not eat Bryopsis. A foxface is one of a few fish that'll eat the stuff. My snails wouldn't do anything, and the crabs only picked at it.