question is can anyone really eat them selves to death on a zuchini

that are like 80% water or something

But in all seriousness, no, he wont. They can eat a lot of vegies as they are very low nutrient content. Eating that whole bit of vege would prob have less nutrition in it that a single aglae wafer, but in the long run is much better for them as it is closer to their original diet of algae.
keep the veges too him and he will be happy and healthy and he will stop when he is full

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