Your vermiculture questions answered
Under ideal conditions compost worms can eat up to half their body weight in a day.
From observation, the need for ideal conditions means that the actual amount consumed varies. The amount consumed also depends on the food stock supplied, the particle size and also the nutrient content.
GENERALLY speaking, you can expect 1000 worms to consume about 125ml (a half cup) per day.
You can find answers to questions just like this and so many more in the Worm Farming Alliance.