Anemone(s)

[Delphinus]

It can be tricky. Sometimes it's just best to leave them to wander onto a new rock and move the rock. You can encourage them to move by aiming a powerhead at them, they'll get irritated and walk off on their own.

Some people suggest using ice cubes to get them to let go. You have to use a plastic film though to avoid direct contact with the skin as they'll get necrosis if it gets too cold. I tried this method once and the anemone looked like crap afterwards and half its foot melted over the next couple days ... even with the plastic. So I myself don't recommend this practise (I'll never do it again). I only bring it up because the suggestion to use ice is still probably out there, it might work for some people but I think the risks outweigh the benefits ... not worth killing the anemone to get it off the rock.

If the foot is accessible, in that say you can get a finger maybe under it, then you can gently and slowly work your way under the foot. Or use a credit card or similar piece of plastic. Slow and steady is key - they (BTAs in particular) have an incredible strong adhesion to rock, you can rip the flesh if you're not gentle enough - and an injured foot is not good for an anemone.

But if the foot is wedged into a depression - which they like, so not too surprising when this happens - then you may find you'll have a heck of a time with this last idea. If you can't get your finger under any part of it then that idea is basically a no-go and your only hope is to encourage it to find a new spot - either by rearranging the rock it's on, or by pointing the powerhead at it.

PS. When I say point a powerhead at it - I'm meaning a small one. Too strong a powerhead stream pointed at an anemone can injure it. You want to irritate it into moving, not coerce; sort of thing.

Hope this helps!