I should have said what I plan to stock this with too. It was a back and forth choice between all male peacocks and haps, or Frontosa. The all mle P&H tank won out. Mainly because of a something Ron said in the Frontosa thread I posted last week were he said to make sure I would be happy with all one fish that look the same. I know myself and the more I thought about what he said the more I realized I would love the fronts for the first month or two then kick myself for not getting something else because I like variety.
We'll I'm glad I asked about the sand here because I was leaning towards black lol. I have white in one of my 55's and black in the other. To me it seemed like when I changed to black the colors of the fish really shows up nice, but on the other hand white does look more natural, and in this tank being 31" deep the white would actually help to reflect the light a bit more in the tank as well. So now I'm reconsidering white again maybe.
I just want to be sure the first time because the last thing I want to do is change out 150+lbs of sand in a super deep tank

lol