Hi
lethargy is a common symptom when fish is in poor health. It could be due to diseases or just poor water chemistry.
did you measure the water parameters to check if cycling is complete? If completed, could nitrate be too high? Were they acclimatized well? Anti-chlorine? Too much fish at one go? Tank size?
Those are some questions that came to my mind, many other possible reasons too. You can try small water changes to see if that helps for the time being.
Good luck![]()









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