LionGirl-Here's what I have on my tank bottom. I have about an 1 1/2 of c.c. to 2 inches of c.c. I went to Home Depot and bought Fiberglass screening, kinda like what's on a screen door. No metal though, fiberglass very important. Put that on top of my crushed coral to seperate my two substrates. Then I went and got the live sand that comes in those bags with the bacteria, marine something. NOt sure of the name (check the exp. date to make sure it's okay) then I bought 20 lbs of live sand from my lfs. They have great live sand, I used about 15 lbs in my 10 gallon mini reef. Lots of life, little crabs and star fish too. Love it! Anyway, that combo looks fantastic! It's a great mixture. The live sand from my lfs is straight from the ocean bottom in fiji. It's cured and work fantastic. When I put that in my 10 gallon mini there was no cycle.
peace
doug