Sand color choice for dwarf seahorses

[mattscheck4]

I'm starting up another h. zosterae tank. I've heard conflicting opinions on the best color substrate to use to see the best color in the horses. What do you all think? Thanks!

 

[Fishguy2727]

I think it should be either solid black or black and white mixed.

 

[mattscheck4]

Any idea what kind of color results I'll see with those color sands?