Probably the longer it sits at the LFS the worse chance I have at treating it to healthy? lol
Awesome!! I'd let the mgr know that this anemone will perish but you are willing to take it off his hands so he's not at a total loss. And that you are willing to take your chances of actually trying to save it.
I see nothing wrong with being honest, but I tend to steer away from trying to short change my LFS on animals that I am particularly interested in. From my experience working at a LFS in my younger years, it really disincentivizes ordering those animals in the future.
I was being honest, he will lose that anemone if it's not treated. If the LFS was worth anything as a reef keeper he would know to treat it with Cipro. So since it probably won't be treated it's going to die and he'll be out whatever he paid for it.