In the first Week there is not much action, the queen got enough reserves and one, two or three Workers don't eat much too.
That changes with the weeks after the first worker.
But I would say, you should feed them first in the tube without arena until they have 15-20 workers, they seem so eat more, if you put the food in front their noases!
Working good seems to feed every day small maelwormparts and Heimchen (don't know the english word
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Seeds don't have to be given every day, but you should change them if they become bad...