There’s got to be other hobbyists that have anemones that have split and are conditioned for aquarium life. Anemones fresh from the ocean have a much lower survival rate and are much less tolerant of poor water quality/change in general, a split from an anemone that’s been in captivity for a while fare much better. On top of the other things mentioned, if the anemone is attached to a rock, just buy the rock, if it’s attached to something else, only buy it if it can be gently massaged off whatever it’s on (usually glass or a basket), so many anemones end up acclimating poorly because their foot gets torn in trying to bag them up. You could also ask that they point a powerhead at it until it detaches itself. One other thing to be aware of is anemone regret. So many people get anemones and they end up splitting until they’ve taken over the tank, even just one wandering anemone can be a terrorist if you keep other corals. I regret adding an anemone (six months later, it’s luckily only split once), I’m constantly having to move corals around when they decide to move (one of the anemones has decided that it’s happiest on the stalk of my toadstool leather, it’s just stuck to the side of the toadstool, the toadstool doesn’t seem too happy about it, but also not too upset). Anyway, just something to think about, make sure it’s something you really want.
