First of all, I have to say that unless you are able to determine the species of a sea slug and its exact requirements in captivity from a reliable source, I would always recommend against buying any of these animals. In their book Reef Invertebrates, Anthony Calfo & Bob Fenner (2003) have an entire section devoted to opisthobranch molluscs and discuss the selection, care and feeding of many of the species offered for sale in the hobby. They discuss the members of these groups in more detail than is possible in a short article here. Julian Sprung (2001) also has some very nice photographs and descriptions of some of the more common sea slugs to be sold in the hobby in his book, Invertebrates. If you don't have one of these books, and are unsure of the identification of the animals offered for sale in your local shop, ask your dealer to show you their copy of the books to compare. Although there are some spectacular pictures in these books, there are only a few of the more than 3000 known species mentioned, and your best resource for up-to-date information about the taxonomy and biology of an unidentified sea slug will probably be Bill Rudman's Sea Slug Forum or Michael Miller's Slug Site. Despite the fact that there are many beautiful sea slugs out there, unless you know exactly what you are buying and their feeding requirements, the rule of thumb is to always avoid ever purchasing any sea slug. Sadly, the vast majority of sea slugs are beautiful, but virtually impossible to care for animals in the aquarium.
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