I personally would try live then if he eats it try f/t the next feeding.
Some try f/t right away with success. If a f/t is refused, I threw it away (back when I tried them) but some refreeze it to try with the next feeding. I personally wouldn't... it starts to decompose as soon as it's thawed, so imagine doing it twice... yuck
Live you would either need a critter keeper and provide some food/ water for the 5-7 you have it.
If he's settled in and was on live before I doubt you'll have a refusal
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