Who told you that?

Sounds like it was either just pooping or it was expelling is zooxanthellae. My guess is the latter as it is not attached.

Try this for some good beginner info on anemones: http://fins.actwin.com/articles/choosinganemone.php

it was actually the store who told us that. The anemone is doing better now, he has settled.

Ive never acclimated any of my anems,but Ive always made sure they were deflated before adding then to the tank.I believe I got the idea it was OK doing it this way from Calfo.Its been a while but I think the reasoning was something like,most anems are in shallow water and that they can be subject to large temp swings due to the tides.Think of being high and dry in the sun or in a warm tide pool,then having the colder water washing over them when the tide comes in.Maybe for a better explanation search through Calfos forums,he can explain better than I can.So far I haven't encountered any problems doing it this way.Although it does make me wonder about some corals,they are subject to the same conditions, so in theory it would hold that they wouldn't need acclimation either. Maybe its the deflation part that makes the difference.

Link to Calfos forum
http://forum.marinedepot.com/Forum13-1.aspx

Try a search using "Anemone acclimation" or something like that should work

he finnaly settled in but then decided to move so we let him then he got sucked into the bottom vents of the overflow.we had to shut down our sump and let him get out on his own and moved him away from the overflow and hes on the move again.