i've never had cresteds do this, but i've had my blue tegu, and a green basilisk do the same. usually within 1/2 an hour after drinking quite a bit if they become extremely active sometimes they will puke up the water. had you recently watered them? it seems to be a natural reflex for them to puke it up soon after drinking it if they are handled much or for some reason are hanging upside down.

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