Is my goldfish sick?

OMOMS

New Fish
Mar 22, 2007
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#1
I have a goldfish - it's in an aquarium with two other goldfish, who I think are common goldfish. I haven't been able to identify the exact sub-species of the one in question. It's mostly a dark, dullish shade of orange - with a black stripe up its back and black on the end of its tail. Recently it's pretty much stopped eating, and has developed a thin white coating. It also goes up to the top, between the water and top, frequently, which I heard could be a symptom? Is it sick?