I posted in the fish emergencies section already about problems I'm having with one of my fish. I'm currently using a mason jar as a hospital tank. I know it isn't ideal but I was caught unprepared and needed to get him out of the main tank. I do want to establish a hospital tank but need setup advice. How big does it have to be? Can I use one of those little desktop or betta tanks? I read one article saying it can be broken down while not in use. If I do that, how do I manage the ammonia/nitrite issues? It took me almost 6 weeks to establish the biofilter in my existing tank...how can a hospital tank be healthy if I break it down between uses? What should go into a hospital tank? Looks like most people keep theirs pretty austere...