Floating Symptoms
If you notice your goldfish swimming erratically, swimming sideways, or even swimming upside down, your goldfish are having buoyancy problems. Goldfish may also look physically swollen or bloated.
Your goldfish might experience floating problems if they are overfed, fed poor quality food, or not fed enough fiber. Dry floating pellets can sometimes cause fancy goldfish problems when the pellets absorb liquids in the digestive tract.