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My fish has a swollen stomach. Is it dropsy? What's the cheapest fix?

Updated On September 23rd, 2025

Pet's info: Fish | Betta | Female

I bought my fish at Petco last week. The day after I got her, I noticed a swelling on her stomach. I’ve done research and found that most pictures point to dropsy. I’m in college and need the cheapest course of action to help her.

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on February 22nd, 2020

Unfortunately, if it is dropsy by the time a fish is "pineconing", chances of recovery are quite slim. You can try a course of a broad spectrum antibiotic. Look for one with activity against gram negative bacteria. You can find them in the aquarium section of the local Petco. Maracyn Two is an example of an appropriate antibiotic. Follow label directions carefully and remove the carbon filter insert during treatment. Maintain pristine water quality via filtration and regular partial water changes as well. Epsom salt can be added to the tank as well to help draw out excess fluid. Dissolve about 1/4 teaspoon per 10 gallons of water in a cup or two of tank water and gently pour it into the tank.

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