I have a pretty green flower pot coral in my tank and I keep finding flatworms on this coral. I've used flatworm exit on the tank twice now. Should I take this coral out and dip it each time I see them? I have a 6 line wrasse in the tank but I havent seen him clean them off at all. Should I be concerned? I'd love to have a flatworm free tank if there are any suggestions for that.