I have a dalmation molly that I bought one day ago at PetCo who is having problems staying upright. I watched the tank at the store for 30 minutes before buying him to make sure all were okay and then picked him out. I put him in my established quarantine tank and he was doing well at first. After 4 hours he sank into one corner and wouldn't leave. Then he started flipping sideways and even flipped upside down a few times. He got worse by last night, having problems staying right side up and off the bottom, and I didn't think he'd make it through the night. I was surprised to see him doing better this morning but he is still slowly listing to the side from time to time. He won't eat though. Could this be a swim bladder problem, or and infection? He has no
ICH spots or fin bites, and his eyes are still clear. He appears healthy in every way but this.
My water is at 0ppm
ammonia, 0ppm
nitrate, 5
PPM nitrite, 7.4
pH, and 75 degrees. I'm not sure what to do and I would like to save him if possible. He is very beautiful, more white than black. I am willing to buy any medication he would need.Please help!

