I recently purchased someone's entire tank of fish off craigslist. He said he was moving and couldn't take them, but I suspect he was overwhelmed and just didn't want to attempt to deal with them anymore as the tank was only 29g, very poorly stocked (schooling fish in singles and pairs, one lonely kribensis, etc) and the water they came in was very dirty. Among them are a glass catfish, two bristlenose plecos and a julii cory. The plecos have no bristles to speak of, the glass cat has one and a half barbels that looked slightly fuzzy when he came home but are doing better now, and the poor cory's mouth is just an O with no barbels at all. The guy said his tank was three years old. I didn't think to test the water before dumping it, but with the lack of barbels all around I can only assume these fish have been living in subpar conditions for quite some time. What I'm wondering is if the catfish have been wounded for so long, is it possible that their barbels may not grow back? The glass cat also has some damage to his underside, a few tears in the edge of his flesh, that have not shown any signs of healing. The cory does not behave anything like the other twelve that I have, nor does he socialize with them (or anyone else for that matter). I haven't seen him scavenging or eating much. I'm afraid he can't find enough food. He's not very active in general, but I suppose it could also be that he's older and has calmed down with age. The plecos seem fine, though their bodies are very small and fat, only about 2.5" long but almost comically fat, so I almost wonder if they've been stunted. Should I be worried at all? Is there anything I can do to help, especially the cory? My water is clean, healthy and changed regularly, substrate is smooth gravel kept clean and I don't know what else I could do. I have melafix but I'm hesitant to treat my entire tank, and I don't want to stress them by moving them again if I don't have to. The tank hasn't been cycled more than a couple weeks, and it took a lot of work to get it stable so I don't want to kill off any bacteria with the melafix. If anyone has any thoughts or experiences please share. I can take photos if it would help, just let me know. Thanks.