Composting question

Composting question

I have a plastic composting bin that I've been filling over the past year. It's been host to many and varied creatures; woodlice, slugs, worms and now, recently, ants. I don't mind the ants at all - in fact I feel a little guilty every time I slug another bag of kitchen waste into the bin and disturb their nest! I've noticed though they seem to be speeding up the composting process - their nest is made of lovely fine, black, crumbly compost where previously there was just half-rotten vegetable peelings. My question is; is this a good thing, or are the ants removing vital nutrients from my compost? I guess there's not a lot I can do about them either way, but I'm kind of curious as to whether ants in my compost is a good or a bad thing! TIA!
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