We're looking into this as well (also vegans), it's just me and my girlfriend though and we wonder if we would produce enough food scraps to feed them. Do you keep them inside? and do you have any issues with them getting too cold?
They self-regulate in terms of food, assuming they have enough space. So if you don't generate enough food, their population dwindles a little bit. But I'm pretty sure a small household would be able to generate way more than what a reasonable single bin can handle. Especially if you eat fruit. Just a few banana peels and you're sorted for like a week! Also, remember they eat paper and other bedding which goes along with the food waste.
