I came home from camping this weekend and found some dead plecos (a female and a juvie (1.5"). I don't know what happened while I was away. They seem to have some type of fin fungus and body injuries (discoloration--red, stiffness in that area). Their fins look like they have fin rot and their body looks like they've been beaten up. The tank (29gal) contains mostly 2" and smaller juvies. There are two males (3") and two males (2.5"). The two smaller males are also showing the fin rot and body bruises (red on the scales). Are there any ways of treating it? I haven't had problems keeping them but after this weekend they seem to be sick. Any help would be great! Thanks!