I am glad you treid it. Your snake is on the way to be a healthy 3' by the end of summer.
On frozen mice I usually put them outside in direct sunlight so they are not wet from the defrost. I use pine shaving as substrate (unless its breeding season) and don't like things sticking on the mouse unessesarily.
Sometime my snakes get frozen mice when it is real hot in the cage. Its usually because I am in a hurry and won't get back to the house for a while. I just fed a couple (core frozen) rats today to my large adults. Have been doing it for years and had no problems. i would'nt reccomend it though. Thats something that just does not happen in the wild
But I sometimes think the snakes appreciate a mouse-icle on a hots summers day once in a while.
On another note I have been feeding mice that are rejected from one snake and are decomposing (slimey and very smelly) and I offer them to other snakes and they eat them with vigor. No signs of illness afterwards. But that is different from feeding rodents with a frozen core which is not natural for a wild snake. In the wild snakes will eat old dead carrion quite frequently. I have found snakes in the wild eating some very VERY decomposed prey. Everything from drowned rabbit pinks to month old dried fish on an enbankment. The snakes i usually feed decomposed rodents to are what i consider to be garbage disposal snakes but they are also the heathiest.
I will say do as I say and don't do as I do. I would never recommend feeding decomposed rodents and especially frozen rodents for anyone. Just sharing some of my experiences. Just because the snakes did not die does not mean it is good for them.
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I don't need no spell chack.