04-03-2012, 03:11 AM
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That's the dwarf neon rainbow fish from New Guinea. They like real warm water 80/82 F...great little fish! They do prefer slightly larger shoals than 4...if you have the space.
Now I believe I have found your problem. I was chatting with the guy in my LFS today (and every other) and he recently recieved some very shabby looking rainbows...slime coat degrading...everything I have already mentioned. So I asked him if it started in the mouth and he said no, but apparently (if you look closely) rainbows have a tiny "hook" on their upper jaw and this gets caught in fine nets and bumped around from time-to-time. He was saying it's only a flesh wound and it will clear up, so long as your water is optimal.
You might do well to add some stresscoat or melafix, but this is not necessary. I guess, just keep an eye on it.
I can claim no credit for this knowlege, you learn something every day! "Hook" on the mouth....who knew!!
Oh and he said only ever use a coarse net to catch rainbows as it is usually fine nets that cause the problem.