my Haplopelma lividum (cobalt blue) has decided to squeeze herself in to the front corner of her tank she was in her burrow yesterday, now she is in the corner, picture below. is this normal or strange ?.
Not acting normal... well, acting normal under the circumstances. You have a very nice setup for a ground dweller, the lividum is a digger though and will want to go down all the way. You will indeed have to add a lot of substrate. But I'd almost wanna recommend you get yourself a flat tank for that and put another T into this one you have there. (Do a search on "digger tanks", that will show you some excellent setups for these types of T's)