I Have had a small valonia issue in spots for a long while, was figuring a couple emerald crabs would help out. Only issue is the polyp safeness issue. I have heard the stories, and dont want to experience an emerald munching on my favorite polyps!
I have been reading a bit on the Red Mythrax Crab. Says they are more common on the reef, and not collected in the shoreline/shallows like the emeralds are. Being acustomed to living on the reef, I read they are more likely to be coral safe.
What are your thoughts/experiences? Would like to hear some first hand experience on this one.