They are good no ammonia spikes or any thing.
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No but when they die they look fuzzy. The show no other symptoms till they die.
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Theres really nothing we can direct you in without symptoms. I would try calling the water company to see if any changes in tap water has happened. You could try taking a sample of water in to get tested. Lastly, you could try treating them with a broad spectrum antibiotic.
Other than that, with nothing to go on we cant really offer any insight.