I did a water change today and forgot the water conditioner at first. noticed she was acting funny and added it as soon as I remembered. This has happened before and she did fine after I added the conditioner. This time, she seemed alright and then suddenly turned over and stopped swimming. I have to hold her upright or she goes belly up. I did another waterchange, called to make sure the water company did not change anything on their end of things and I don't know if there is anything else I can try. She is breathing and she moves her eyes. She can move her fins but will not swim or stay upright....anyone have any suggestion at all???