Good luck! I have never heard of them breeding in captivity (unless you get a pre bonded pair wild caught) and given there savage demeanour it's going to be tough. But as a total guess from a guy that's owned 2 over the years (and loves the species dearly) try a 6 foot tank with 2 distinct seperate areas of rocks and wood at each end with a clear area of sand on the middle. I very nearly did this a year ago but was warned off it. But genuinely good luck.