So we bought some Xenia, and saw a weird tentacle looking thing. Didn't think much of it. Come to learn we have aptasia :/. We have peppermint shrimp, but all of them have ended up in the sump except one which is quite fond of hikari's crab cuisine, so he's useless. Should we get some more of these guys? Is there any sort of spot treatment we can do to get rid of it?