No harm done, although I would rather treat than flush.

So what you are saying GRUE is that I should expect this to spread to the other fish?

I first noticed this late last week and yesterday it was at it's worst. The fish seems to have no ill effects as it swims around as if nothing was wrong.
When the light came on this AM some of the swelling had subsided and it is still down now, into the evening so I am hoping that it will continue to improve.

GRUE- You can get Blue Reef Chromis for $2.50? I need that connection, please share. I can hardly fine them online and when my LFS has them, which is rare, they often refuse to eat.