Ok, so now im thinking there is something in the water that killed my fish, no idea what but it looks nasty.
The nandus nandus that survived has a nasty red, inflamed, almost bloody looking fin that shes barely using.
My smaller jurupari has the same thing but instead of red its just white, inflamed and almost shiny, and two dots of shininess on its back fin.
My common pleco has red, bloody looking fins on the back tips as well. Im not the best at explaining so ill just get photos.
Ive added dechlorinator just to be on the safe side, well water usually doesnt have chlorine, but id like to be safe.