Live on the Big Island of Hawaii, east side so it rains ALOT! Have found Home Depot Quikrete Play Sand, Basalt Sand, Coral Sand, Coral Rock & Crushed Rock....The rock is coarse so plan on that going down first (drainage) with the "sand" on top. But what kind? Need to call the gravel company here to find if I can get "construction or mason" sand. Here in Hawaii we can't/don't get what you can on the Continental USA

So I've got researching to do on the types of sand we have here....No, we can't take sand from the beaches anymore.
So any other advise? Below I got pictures of the set up I got going now, I stopped "raising" chicks for the breeder so I could have a few "pets with benefits" of my own. I got 2 EEs & 2 RIRs - They LOVE their "under the table coop", come in on their own every night or when something scares them.