Hello, and thank you for reading this. Marvin The Betta died. I am getting a 75 gallon saltwater tank because one that was already set up got sold before I could get it. When I set it up and let it cycle, do I need to go ahead and put in sand and rocks while it cycles? or just wait until it is done? Thank you for your help! Also do I need to do anything special before I put in corals and fish? Thanks, Marvin The Betta.