Ok so I admit it - I'm the only person in the universe whos Kribs can't get it together! 
They've plenty of cover and have dug out several 'caves' which they protect for a few days before losing interest and moving on.
They have a varied diet with regular water changes. I don't have all the water parameters but nitrates are low and our water is naturally hard. I started off with the temperature fairly low and have tried upping it to no effect.
Any hints / tips?
What age are they mature from? She is still youngish but she's had her full colouration since I got her 2-3 months ago.
This is their latest cave which they've now abandoned again today.

They've plenty of cover and have dug out several 'caves' which they protect for a few days before losing interest and moving on.
They have a varied diet with regular water changes. I don't have all the water parameters but nitrates are low and our water is naturally hard. I started off with the temperature fairly low and have tried upping it to no effect.
Any hints / tips?
What age are they mature from? She is still youngish but she's had her full colouration since I got her 2-3 months ago.
This is their latest cave which they've now abandoned again today.

Anyone got any ideas on this one.....I would like to know as well......might stick a few Kribs in the 29g once I got the big one up and running.....