came home today and noticed that one of my neon tetras, which i just got about 3 days ago, was swimming in circles, upside down, and gasping for breath. i checked my water conditions and everything is ok. did a little quick research and it looked like swim bladder disease. before i could make it here to post a question, he died. now my question is, if it was swim bladder disease, can it spread to the rest of my fish in the tank? and if so can i treat the entire tank?