Bladder Diseases More Condition_symptoms I Think My Fish Has Swim Bladder Disease?

I think my fish has swim bladder disease? - bladder diseases more condition_symptoms

I think my goldfish has swim bladder disease, and what I changed their water daily, and I give a pea in the morning and evening. In addition, the water level lowered to help a little. (2.65 liter tank) I use air conditioning in the water, but what now? Sometimes the fish swim, but always moves back into the bottom of the tank. Please help save my fish!