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theres really no need to do imo i would add rock, sand, water that way you reduce having sand all over your rocks. so just make sure to poor the water onto rocks or a plate depending on the size of the tank.
Well I think he said rock first because the rock shouldn't sit on the sand it is less stable and a chance of collapse. Especially if gonna have pistol shrimp of sifting gobies. Best to have Rock on glass then fill in sand around it