I just finished up moving my wild collected snails, serpent star, sea cucumber and some algae to my 2 tanks. But I found these 2 in there as well. I think they must have been in the algae I collected.
Mantis shrimp: It will go in my 40g anemone tank. It may go after some snails and I don't mind.
I think this is a nudibranch and it eats coral polys and anemones. So it can't go in either of my tanks. Too bad, it's kind of cute. And in 20 years of snorkeling and collecting clean up crew in the Florida Keys, I've never seen one of these.
Right side up:
Upside down:

Mantis shrimp: It will go in my 40g anemone tank. It may go after some snails and I don't mind.
I think this is a nudibranch and it eats coral polys and anemones. So it can't go in either of my tanks. Too bad, it's kind of cute. And in 20 years of snorkeling and collecting clean up crew in the Florida Keys, I've never seen one of these.
Right side up:
Upside down:


.