I keep a reef tank ---46 gal with a blue tang , a couple clowns , a gramma and various snails , emeralds and blue legs--is there any problem introducing a small tube anenome?
Nope. Cerianthids are actually harmless suspension feeders, and should do well. Just be prepared to feed small doses of tiny foods frequently. I should bookmark this article by Rob Toonen, I seem to post it every few months.