They breed every month in my tank, like clockwork. When the famle is getting ready to release, the egg mass under her abdomen will turn from the blue color to a clear-grey-white. and look "fuzzier."At that point the eggs are hatched and it's all larvae under there.
Those little crabs are pictured in one volume of The Reef Aquarium by Delbeek and Sprung. Also in the Julian Sprung invertebrate guide. They refer to them as sessile hermit crabs. Very neat looking in the book. I would love to have some Bisma rock with worms and crabs!
BTW Bisma Rock seems to be...
