Hi Gaboon - if I am not mistaken, that looks like an aptaisia..... Hope not. BUT, if it is - you better try to kill it (try injecting it with some strong kalkwasser solution), alternatively, with something called "Joe's Juice" - or vinegar/pure lemon-juice may also work.... BUT no guarantees.....
Isn't the tentacles a bit too long for a button polyp? I struggled between these two as well in the beginning, but then decided that the tentacles are far too long (I have button polyps and the tentacles are FAR shorter than what I see on the pic above) - also, the coloring is not really that of a button polyp??
No problems, likesfish. Thanks for posting a pic that gaboon can have something to compare to. Perhaps we should post a picture of aptaisia as well?
Someone have a close-up of aptiasia to post perhaps?