Yes I was going to get some fairy wrasses. And from what I've heard, they get huge and I take a risk. Would I be better off just sticking with dwarf hermit crabs. I really like my halloween because he eats everything. There is this really tough and thick hair algae that he seems to be hacking down on. If I had to get rid of him, would a lawnmower blenny eat this type of thick algae? What I'm really afraid of is that I'm going to have a male female pair, the female is generally fairly small. That would be an easy shot for the crab. And isn't the crab that starts eating fish just a lesser likely rogue of the bunch?