When I bought my BTA, he moved all over and got sucked thru the California overflow grill. I found him on the filter floss in pieces the next morning. I put them back in the tank and got 2 full-size anemones now. At first, they had no mouths visable but after a few weeks grew mouths, took on a nice, healthy green color and went from quarter and half dollar size to 5 or more inches. Don't give up, they may survive.
*NOTE* This is not a recomended way to frag an anemone!*
Mike