What is DSB? We have a fish only tank. 1 Clown fish, 1 yellowtail damsel, 3 blue green reef chromis, 3 blue legged hermits, 2 red leg hermits, 1 peppermint shrimp, 1 firefish, 1 scooter blenny. We are working on finding some snails and will get more hermit crabs. We want live sand to help with live rock if we go that route. We were also considering getting a jaw fish and I think they need 4" of sand. Would it work to leave the crushed coral in for a base and then add live sand over it?:notsure: