3Parts; 2 Parts; 1 & 1/2 Parts
3 Crushed coral, Shell grit, or what ever you feel is Reef safe an d in any combination you prefer.
2 cement (White pool cement Grey also work but it I think it looks kak).
1 & 1/2 Coarse salt, or macaroni, dried peas, dried beans (All of this will dissolve...