Yay or nay?

[Silverfish]

I recently acquired a tahitian yellow belly damsel. (from my brother) I am thinking of putting it in my 60g reef with a lawnmower blenny, (that is hanging in there) and a royal gramma, (that I haven't seen in 3 days [img]images/smiles/icon_confused.gif[/img] ) The damsel is in the sump right now. He is small and timid, but I know that it will grow and get a bit more aggressive. Just want to know what you all think. Very cool looking fish!
BTW, I also have a 15g reef on the same system with a maroon clown and a citron goby. They are happy together, but I don't think the damsel would be the best for them...?

TIA , Bruce