This week picked up a Brown Warlock Zoa and this morning while it was opening I noticed this odd thing on it (circled). The Zoa opened fully and has been all day, it is not bothering it but I wanted to see if I should remove it.
That is my thought currently, it did not match up with anything in the common hitchhiker thread, closest thing I could think of is hydroid maybe? Other thought is it kind of looks like a baby feather duster worm based on google image search.Looks like a possible hitchhiker, but I'm not 100%.
I just did a Google Image Search right when you posted and it looks like a few I seen in the examples as a baby one. I hope that's the case, I just dealt with a hydra issue in a shrimp tank, I'd hate to deal with the salt equivalent.I'm pretty sure it's not aptasia, but it kind of looks like a small feather duster worm or other filter feeder.