I have got my colony for over 6 months now,
haven't had a problem so far.
They have always been very active day and night,
when I recieved them there were like 4 workers and immediatly 1 was exploring the outworld in the middle of the day.
In my other small colonies the workers would only forage at night.
I find them very easy to keep.
They eat almost every kind of small seed and insects you give them.
If you keep them around 27°C like I do, they will grow fast enough.
I keep them in a ytongnest and I never noticed them digging.
I think they wont try to dig as long as they have plenty of space.
I hope this is helpful to you!
