My betta is bloated with a dark spot, and peas didn't help. What's wrong?

Question

My betta fish is bloated and has a dark patch on his left side where the scales are not laying flat. What I tried feeding him a pea, but it didn't help. Please help! Pet's info: Fish | Unknown - Fish | Male

Angel Alvarado, LVT · Accepted Answer

Check water chemistry, quality and temperature. Use a home test kit or submit a water sample for testing to confirm an absence (0ppm) of ammonia and nitrites with a nitrate level of 20ppm or less. High ammonia levels may cause "burns" which may present as black spots on the scales. Most pet stores will test water for free or for a small fee. Perform a partial water change, no more than 30 percent of the total volume, to stabilize chemistry and maintain or improve water quality. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. Check the water temperature as well. Bettas are tropical fish and do best between 78F and 80F. Low temps can affect digestion in fish causing constipation. Maintain water at 80F and fast for 3 days. Resume feed tiny bits of cooked and shelled green peas. Feed peas until defecation and swimming are normal. Feed a quality pelleted diet and fast him one day a week to promote regularity.

My betta is bloated with a dark spot, and peas didn't help. What's wrong?

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