Maybe, maybe not.
Today I'm returning an emerald crab that likes to munch on not only hair algae, but also bitty sponges and coralline algae. (I think I'll stick to snails from now on.) From reading posts, it looks like it's really the luck of the draw with a lot of clean up critters--some individuals are model citizens and others eat anything they can get their claws on.
tank with 29-gallon sump
2x Maxijet powerheads
Mag drive 9 return
Coralife 4x65 Lunar Aqualight
120 lbs rock from liverocks.com
1 peppermint shrimp and 1 fire shrimp (very shy)
2 black Ocellaris, Squish and Smudge
3 chromis, too identical to name as yet, in QT
29-gallon with two goldies, Carrot and Orangehead