my fridge is around 43F. ive kept the axie in it for up to 3 weeks with no ill effects. it even started eating again after the first week in. it took maybe 3 days from when i ordered it to when i got the package, a box with a small sealed bucket packed in styrofoam. make sure your tank is completely cycled and the temp not above 70F. axies have no scales just skin so they are VERY sensitive to ammonia, nitrite/ate, and medicines. they are remarkably tough creatures tho and most injuries will take care of themselves in the fridge with salt bathes.