I had been keeping them in bare bottom tank:

I wanted a substrate in the tank, as substrates looks a lot better to me.
Rob keeps his young in a bare bottom tank, so this was the first time they will have been in a tank with a substrate.
It totally freaked them out and they all piled into one cave


They were pretty active before and constatly squabbling over caves, and for the first few days the only signs of movement in the tank was the odd track in the sand.
It even put them off their food for a while, though they are starting to settle down again and food is being eaten.
Who would have thought a substrate would have affected them so much

The three adults i have in another tank, were neither up nor down when i put the sand in the tank, they just cleared spots with there tails:

