After getting a few more corys the other day, I realized quickly that there was one major difference between those ones and the ones already in my tank: those ones had (relatively) long, flowing fins. This morning I isolated the two smallest and most extensively damaged of my 7-strong albino school in a breeder box, but I don't know what I need to do now to help them regrow their fins.

You can't see it well here, but even their front fins have been reduced to little stubs. The larger corys are damaged, but their injuries aren't nearly as bad. I'm pretty sure that it's my tiger barbs that did this, but I just boosted their numbers, so I hope that will prevent any further aggression against my peaceful albinos... Any advice?