My axololt is swimming back and forth in tank for three days now in a row. She is just pacing for three days in a row. She looks healthy and fine. Water parameters are perfect at ammonia 0ppm, nitrates 10ppm and nitrites at 0ppm. Water temperature is 61 degrees cold. No other axololts in the tank with her. I have no idea what is wrong with her. I have taken her out of the tank and she does this in the hospital tank back and forth. Any advice would be great. Thanks!