I've not had much experience with PC's and anemones, but you'll be fine with softies for sure. When I've run PC's, I replace them every 6 months (same as with VHO's). If upgrading isn't an issue if needed, you can start with what you have and see how the anemone reacts. I'd make sure the tank is cycled and ready for animals, first, though. Tank raised anemones can be pretty hardy, but if the parameters are still swinging, etc., anything can be stressed to detriment.
It'll move around until it finds the spot it likes, but should mostly stay put after that. If the anemone doesn't seem to settle down, it may not be getting what it wants (can take weeks sometimes for them to find a spot rhey really like). What I used to use to judge the happiness and general health of an anemone (haven't had any in a while) was touch the oral disc and see how sticky it is. A stickier anemone is a healthier anemone. The mouth should stay fairly tightly pinched. If it gapes open and stays that way, it's either very unhappy or generally unhealthy. When purchasing one, look for the mouth gape. If gaping, don't buy it.
Try to find tank raised specimens if possible (lots of BTA's out there), as they are already used to tank conditions and tend to do much better on a 1:1 basis with wild (generally the case for tank raised anything versus wild caught). It's not highly unusual for the mouth to open up a little for a short period of time, but if it is gaping and staying that way, something is wrong.
Make sure it has good color. Stressed anemones bleach out and IME aren't the easiest to get back to good health. You can feed if they will eat. I used to force clones on BTA's through feeding. Krill were a generally accepted by the healthy anemones. Once they are eating, go sparingly on feeding them (not necessary to feed them if lighting is good). I'd trigger cloning by getting them used to a small amount of food for a week or two, then dramatically increasing the feedings. You can run into issues with having too many anemones in the tank and no one to take soem from you, though. I know I did
. The babies tend to wander a lot more than the parents. Once they settle into a spot, they can wreak havoc on your corals. When my anemones would wander, they might sting a few things, but only a little. Once they settled into a spot and started protecting their territory, they could get pretty aggressive towards corals in their area, though.
They can also split due to enviromental upsets. I had a RO filter issue at one point years ago. Went from two mothers to two mothers and eight babies. Most of my coral were dying because of the bad water, but the anemones practiced survival by splitting. The mothers had been well established and healthy prior to the RO issue. I may have lost them, had the mothers not been as established as they were.
Maybe a little more info than you were looking for, but I was just spouting off most of this to a local guy that is setting up a tank for his son that has an anemone he bought from someone selling out, so it's still fresh in my cess pool of a brain
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