I have a male betta. We have had him for about a year and 1/2. He is completely lethargic and just floats at the top of his tank. He is completely still at times. He is unable to stay under the water. His scales are not sticking out and his color looks good. The pet store told me he has dropsy and I have been treating him with Maracyn-2 for 4 days. He has not responded at all. I am thinking it is not dropsy but a swim bladder problem. He has almost no interest in eating peas and has only eaten 3 tiny bites of pea in the last 4 days. I haven't seen him poop, but don't watch him all the time. He is also gulping at the surface at times. He is in a 5.5 gallon tank with a heater and filter. The filter is currently empty because of the maracyn-2, but is is still circulating water.
Any other ideas af what is wrong or what I should do for him?