my Lemon Peel is in my FOWLR......there are some GSP and a few Paly's that it doesn't bother but I wouldn't trust it with anything I like as far as corals go...if it was a problem I'd hate to try to take it out....another really good one is a Cherub Pygmy Angel...small and lots of color...usually fairly safe with corals...but it's still an Angel...I had no trouble with mine
here's a pic for you to see what it looks like
