I've see one, once. lol This probably wont help at all but. When I was working at a little local shop in Ca (long ago). The owner was so excited that he got one in the store, but it died after a few days to a week. Honestly I think the water quality might have been the culprit (had suspicions about the competency of the guy that was in charge of the salt section). Never seen or heard of one before or since. But I remember how beautiful it was, and how mad the owner was when it passed. But since I've been trying hard to focus on freshwater only, just disregard what I ramble about and count it as a sighting. lol