04-03-2014, 05:47 PM
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His fin should grow back over time. He may have been bullied, so watch how the others treat him. If you see a bully I'd suggest taking either him, or the bully back though, otherwise it may get worse. Sometimes it takes a bit before they let in a loner with minimal nipping, so if they don't run him down or chew on him, they'll probably let him in once he starts feeling more secure.
So, if he's not sick, doesn't get picked on or have an infection, his fin should repair pretty quickly(within a month or so usually) and he should fatten up. =)
Keep a close eye on him, if he doesn't start gaining weight within a few days, at least a little, it's possible he's got a parasite, so keep him and the other two newbies in your holding tank for at least two or three weeks, unless you see something, then treat it and keep them separate from other tanks and fish longer.