I wouldn't say they are a grave risk. Like I've said, I have kept two in a reallatively small tank for over a year with absolutely no problems. I have occasionally noticed them picking on a zoanthid polyp in passing, but they have never caused any damage to them. IME, emerald crabs are strictly herbivores and the only reason I can imagine them doing any harm to fish or corals is if they were near starvation. I say give them a try.
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-Dax
"I don't believe there is a man, woman, or child alive today who doesn't enjoy a lovely beverage."
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58 gal. Oceanic RR, 15 gal. sump w/ mag 9.5 return pump, Gen-X PCX-40 on closed loop w/ SCWD, Turboflotor 1000, 250w MH, 20 gal. refugium/frag tank
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