Dark Rocks for Cave Building

[gnatster]

Have my eye on a UNS 45SA, a shallow all-in-one, to house Mexican Orange Crayfish. I've been flipping between pictures of rocks, trying to imagine what would work well. My idea is a cascading wall of dark rock, with caves and epiphytes stuffed between the cracks. Leading to a foreground strewn with pebbles of the same rock over a base of a lighter colored sand, along with leaf litter and pods. The orange coloration of the crayfish ought to pop against the darker rock.

I've been trying to picture the layout with one of these:
Blue Rhino Stone
Manten Stone
North Black Stone

If I had my druthers, the stone is available from Buce Plant, where I'm sitting on a sizable credit.

Comments, suggestions, etc, all welcome.

 

[techman81]

Black Lava Rock is probably the darkest, but not sure if it's the look you want.