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My fish are bloated and dying. Is it parasites or another illness?

Updated On September 23rd, 2025

30 gallon freshwater tank 6 peaceful community fish, planted tank. nitrite0, Ammonia0, nitrates low. ph 7. One molly died quick and sudden. another molly (bloated not pregnant) bottom of tank looked dying. put in salt. She improved. wite tube poop. still swimming bit crooked. one neon tetra swim bladder died. another tetra very bloated. parasites?

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 22nd, 2017

Parasites, constipation, stress or bacterial infection are all possibilities. Maintain adequate water quality. Continue with the salt treatment, it can decrease stress, aid healing and may treat minor infection. Consider a product such as PraziPro or General Cure by API to treat for parasites. Constipation can be managed with a 3 day fast followed by feeding bits of cooked, shelled green peas until defecation is normal and regular.

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