left my goldfish with my parents for a while I had things to do at school. I came home to find the he had fin rot and was in kind of rough shape (I was furious). He did swim around still and eat when we fed him so I immediately went out and bought a new tank and gravel completely resetup a new tank dechlorinated and everything. He was doing all right just swimming around relaxed okay. The next day I went out and got some melafix medicine from the store. Everyone recommended it to me and so I trusted the recommendations and wanted to help my little guy. I added the recommended dose the tank and went to sleep. I had more than enough oxygenation with the bubble stone and a filter running without carbon. I woke up today and he's sitting at the bottom of this tank mouth opening and closing. He won't move or eat he is just laying down there. Would it be best to move him to A temporary quarantine tank of clean water without the medicine? Or is he just best to stay there while I continue to treat him? This is very urgent as I'm worried for his life please respond quickly. I love this little guy. Was it the medicine? Did I kill Dart? I am so worried.