Hi, I have 9 young long-fin rosy barbs that I bought 5 days ago, who are currently in a qt tank. 3 or 4 of the barbs have a few ragged spots on their tail fins. One of them I believe must have been injured, either already when I purchased it or perhaps when the employee netted it for me, because its tail fin was split almost up to the root. Thankfully this has been healing nicely on its own--at least half of the tear has grown back together. The other fishes with ragged tails look pretty ok, with just one or two small tears per tail fin. I am debating with myself--is this fin rot? Or are long-fin varieties simply prone to looking torn? They don't look that bad, no fungus or open sores, but their tails just don't look as "perfect" as some of the others. Would anyone recommend treating with an antibiotic or antifungal med while the fish are still in qt? Thanks!