I think you keep the shrimp in the fridge too long is the cause?? One week is max for shrimp that I feed to my flowerhorn and blood parrots. I deshell the shrimp and cut into small pieces.
You should be freezing the shrimp an thawing under hot water when ready to feed. Freezer preserves it and hot water kills bacteria.
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What does this have to do w/ it? I feed my rbp shelled shrimps 1x/week. Jw
#1 S. Vettel