Hi. Abby is a calico ryukin supposedly, though she has a long flowing tail and I don't see a hump. Her body is almost 2 inches long. I have had her since last summer. She is in a 29-gallon tank with no heater. There is an aerator stone. She is the only one in the tank. I change out 6 gallons of distilled water each week. By that I mean I fill my gallon jugs with water and then let them sit for 24 hours without a lid to let the chemicals out and let the water get room temperature. I then add a dechlorinator into the water jugs. I also add Cycle bacteria into the tank when I change the water. I thought that would make her feel better, and I know bacteria is important. I just started this last week. I use a syphon and so I clean the gravel that way. I always fed her Hikari goldfish pellets and sweet peas. But she has started floating more and more. I have always soaked the pellets a long time to soften them up. I got some veggie flakes and goldfish flakes. I soak them a long time so they soften up and sink. I thought flakes might be easier on her stomach. Plus I feed her the peas. The peas have no sodium. Maybe I should feed them more often? There is the whole story. Advice? Thanks for the welcome! P.S. We have hard water.