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[ssssnakeman]

the main thing to worry about,imo,is that whatever they eat has no substrate attached to it,
whole animals are probably better as they dont pick up the sand like animals that have been cut,eg,half a rat or a piece of chicken fillet.
i learned the hard way when i lost a young monitor to a gut impaction that was caused by sand stuck to meat.
he was dead before we got to the vet..