So for the past couple weeks I've noticed that my male crowntail wasn't doing so hot. I thought it was just the stress of moving him back and forth between home and school over spring break. He would lie at the bottom of the tank, flopped over on his side. Though he would normal be at the bottom of his tank resting for a bit, then swim around. I really have no idea what made him sick, but he just kept getting worse to the point where he couldn't even swim properly. I didn't do anything different, fed him the same food, used the same water conditioner. Though I think he was probably sick-ish when I bought him. Though I am still glad I bought him, and had him as a pet for 3 months.