Okay. So I bought a jack Dempsey from petco along with a thirteen gallon complete setup 1 day prior to buying the fish. . Anyway. I bought five comet goldfish because I'm new to this and the manager at perform said they would die overnight and that my tank would be cycled and have the bacteria it needs within 24 hours. 24 hours came. And the goldfish were still alive. So I went back to petco and the same manager told me that it would be okay to now put the jack Dempsey in the tank. I noticed he was being a little sluggish today. So I donated the goldfish back to the store and checked my ammonia levels which were sky high because of the goldfish and the tank not being properly cycled(didn't know this beforehand). I bought live bacteria and put it in the tank but he still is barely moving. What do I do??