Reefftown.com has them. I got some from them. But I didn't order enough I think my peppermint shrimp ate them. I ordered the tank bred aiptasia eating peppermint shrimp from liveaquaria and they were smaller than my aiptasia then I ordered (not enough and too small) Berghia nudibranchs I should have just ordered 10 medium Berghia and been done with it. I used joes juice about a week ago. It worked on all of them. So far I have seen a few new ones tho. I just keep feeding them joes juice. The big one was hosting my sexy anemone shrimp, that one lost most it's tentacles but I didn't get enough juice to glue him up, so he spit out some spores. I know the peppermint shrimp are doing well as I have seen their molts floating a couple times since I got them a month ago. I never see the Berghia anymore and have only seen the peppermint shrimp once. They do have a lot of space to hide as well as I'm sure there are aiptasia where I cannot see so maybe they're tag teaming the aiptasia. Sorry that is probably a useless post but I'm not erasing it. It took too long to type