Substrate is Lapis Lustre #1C. I have used it with rays for years, its not part of the issue. I think you guys are correct in pH swing.Ph swing or maybe something went wrong while eating, what did you feed, what is your substrate, plz provide any details about the feeding, and did anything weird happen during water change? Any heaters in the tank itself?
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Does your house have a whole house filter or water softener bro?