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If you have answers, please help by responding to the unanswered posts.
Stress from what? Other fish? Your water conditions? We will need some more info in order to be able to help you-
Tank size?
Is it cycled?
Water parameters?
Tankmates?
Is he new/was he properly Qt'd?
How was he acclimated?
Are any other fish new?
How long have you had him if he is not new?
Lets start with this information & we will go from here!