>>Did you give the peas raw in small pieces?

No, I put the whole pea in the water. It floats, so she made her own pieces. You can make small pieces though if you'd like. I see no harm in that. Is he doing any better yet? Are there any other changes that you see?

>>There is a female betta in the tank (5.5 gallons), separated with a separator.

I see no problems with that. And you said she is fine, so whatever he has isn't contagious. That makes me think swim bladder disorder of some sort because there really isn't any other problems that lead to swimming issues.


>>I don't have a kit. I can get one tomorrow, though. The female in the same tank is perfectly healthy it seems like.

When you get one, let me know what the water parameters are. Mostly ammonia, nitrites, and nitrates. pH and temperature wouldn't hurt.

>>It's a 5.5 Gallon tank with an in-tank filter. I change about 1-1.5 gallons (20-30% of the water) every 2 weeks. So far, they have been doing real well with that routine. The female still is.

That's really good, so I don't think you would have water quality issues.

My educated diagnosis is swim bladder disorder. Let me know how the peas work... give them a few days to help get whatever out of his digestive tract. Also, have you noticed any feces since you've seen the problem?
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Phishie

"An ounce of prevention is worth a pound of cure."

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