Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
Do they have white or black on the edges? Do they look torn or more like they've been "melting"?
He might have fin rot. If that's the case, then do a water change (remember, you have an un-cycled 1-gallon...you should be doing 100% water changes weekly) and add some Melafix. Melafix should help his tail grow back. If you have aquarium salt then I would add that too.
If it's not fin rot then he might be biting his tail. This can be brought on by stress but some fish just chew on their fins for seemingly no reason. You can treat him with the same things I named above. Aquarium salt will help keep it from getting infected and Melafix will help his fins re-grow.
It's possible that the filter currents are stressing him out. What kind of filter do you have?
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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