With a rat pink, I would feed every 5 days...if he is willing.
Once you see that everything is working well (urates, poop) and he continues to do well and gains well, I would bump up one food size and try every 7 days.
By then he should be getting ready for a shed. I would not feed during the shed cycle at all.
If everything is going well thus far I would then start feeding what one would "normally" feed a snake, based on his size. Pick the rat out by how wide around he and the rat is.
I would only take it slow and careful in the beginning, until you see how his body is handling it.
These are just my thoughts and opinions, though. Keep a careful watch on him, and adjust your schedule as needed. Keep posting about him along the way and you will get additional help and suggestions.
But for the first few days (minimum 4 or 5) I would just let him settle. No handling. Hopefully he will settle quick and drink well.
What a lucky snake he is !!!!
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