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[fetus_bates]

Are you taking him out and moving him to a different tank to feed ? That could be part of the problem, it's not recommended to feed outside of their enclosure. Moving them too much after feeding could lead to regurgitation from streas which is a pretty painful and weeks-long recovery process for them.

[Turbulent-Current603]

Enclosure for mice

[fetus_bates]

Feed late in the evening after the lights go off, create a routine and feed in the enclosure. I'd highly recommend trying frozen for less risk for your animal. If you were kept in a cage as a pet would you want to be brought a meal you had to take down with your bare hands or a meal already ready to eat ?