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keeping any variety of barb together with impunity is a myth
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I agree...there is always the exception to the rule. For example, you could have a school of the most docile fish in existance and find one which 'broke the mold' and causes a lot of issues for its tank mates. An even better example are tiger barbs! If you were to look in any number of places for info on tiger barbs, I am sure that you will see that they are 'labeled' as semi-aggressive, and you are now starting to see that this label is really true since they are very apt to nip at other fishes' fins and such.
However, generally speaking, the larger the group of school of tigers you have, the less likely you will encounter aggression/nipping issues. You are also less likely to see one tiger picking on another if there are other types of fish in the tank as well, but that isnt really solving anything since the problem is just going to change from your albino tiger being injured, to the other fish being injured. Sort of like sweeping a mess underneath a rug.
But hang on for a minute...as I see it, you are now in a rough spot with these tiger barbs because they seriously grow to be much larger than some of us might think. You can trust me on this one since in the past, I have kept some tigers which were easily three inches from mouth to tail, and were probably close to the same from top to bottom, making them a pretty big, round fish. That said, your 10 gallon tank, IMHO, might be too small for tigers over the long run. Keep in mind that tank size also plays a part in aggression levels...in extreme situations, this even applies with schooling/schoaling fish which tend to stick close together all the time.
I agree that you should probably quarantine your injured fish and possibly even treat it will an antibiotic in order to prevent infections in the wounded areas. IMHO, if you do this, I suggest treating it with a dose which is less than the suggested amount in the med's directions until you are sure that the antibiotics are truly needed above and beyond a preventative measure. Dont get me wrong, I would normall not suggest using any treatment on a 'just in case' basis, but this may be the exception to a very small degree.