if you want a preview of how it will look, I did the same with my Aqueon 150 gallon tank:
black seams
black gravel (estes)
black background (though not painted):
plastic plants for my plant eating fish LOL
granted, your lighting is 4000x brighter than mine, but it gives you some idea of the black on black look...I'm pretty happy with the look. it looks sharp IMO.