Ok I've read all the ways here to rid them. I haven't added anything to my tank for 6 months but just noticed it the other day wedged in a tight crevice where my zoas are. I think I would damage my Zoas if i tried to use the X or F product. TSM has Aiptasia eating file fish. Not sure what to do. I don't see them anywhere else but I have a lot of areas I can't see.