I noticed my zoas were closing up this week. Started closely inspecting and noticed what appears to be small nudibranchs on them, my assumption is zoanthid eating nudibranchs. I dipped all my zoas in revive and used a dropper to suction off any that I saw that didn’t make their way off. I have removed 4 in total. Have not seen any the last two days, but I’m going to assume they are still there.