for several days, one of my neon tetras has been showing symptoms of sickness. not eating, staying in a corner, no interest in food. I assumed he was sick, and placed him in a pre-medicated tank. I put him into shock (huge mistake on my part) but managed to bring him back with a lot of stress coat. he's recovered from the shock, and I currently have him in a cup. I'm not sure what to do. there's a chance he may not even be sick, just stressed. I know this whole thing happened because I slacked off on water changes. I'm now doing regular water changes, and have carbon in my filter. all the other fish are fine, just this neon tetra. I'm not sure what to do, if I should put him into the pre-medicated tank via lengthy drip acclimation (I don't want to risk putting him into shock again), put him back in the main tank and see what happens, or treat him separately from the pre-medicated tank. I'm going on a 10 day trip in 3 days, so I'm pressed for time. any advice will be appreciated. I don't want to lose him.