I've been keeping a starting colony of Formica fusca-group species for about 11 months now.
And their growth rate is nothing like expected - many people say it's a simple species that grows pretty fast, but even after a proper hibernation (3 months) the queen is not laying larger piles of eggs. There are just 10 workers and 10 pupae with a little pile of eggs.
It's not that the queen is not laying at all, but is the rate of development supposed to be like this at first?
I feed them sugar water and fresh worms or egg yolk every 3 days. They're still kept inside a test tube and the temperature is 24-27 C.