No! The plastic screens are not enough, an anemone is subject to wandering for a whileuntil it finds it's place in the setup, and will always end up stuck in a powerhead screen or intake. I'm sure if you do a search on this board, or any reef related board for that matter, you will find posts from reefers who have kept an anemone long term, (or sadly, short term), that mention, if not warn, against the dreaded anemone vs. powerhead battle, in which the anemone will lose. You would be surprised how much of a deflated bubbletip can get inside and pureed by a plastic screen covered powerhead. If you have powerheads in your tank, cover them with something, foam, floss, whatever, an anemone can get sucked into a plastic screen! Also, I think that your mandarin will be eaten by an anemone, eventually, but I have read that a hosting clown will chase off a mandarin, and hopefully, thwart it's untimely demise! Good luck with your anemone, my bta is very hardy,and is my favorite animal! Joey