i second what chort said, i had a flame for about 8 months untill it died randomly and never nipped at anything.

I dont have a flame in my 90g but i do have a coral beauty and potters angel which are kinda hte same type of angels... they nip here and there but i've never lost anything to them chowing down on a coral. But it is hit or miss, some people have luck some people dont. Sometimes people like hte risk.