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Anyone have a clue as to whether this is aiptasia it's the first one I've found but I'm not 100% thanks in advance! It looks a bit like a filter but has tentacles well that's what it looks like but not sure
Sounds like aiptasia to me. Products like aiptasia-x and joe's juice work wonders. Some have success with injecting them with boiling lemon juice or water, but I have not personally.