If your planning on moving in 5 months I would set your tank up without sand. This way you can get your live rocks to mature a bit before the move so when you set the tank back up at your new more permanent place you should be good to go day 1 (add sand then if you want). Sand is a nightmare when moving imo. Makes the break down take longer and its really messy when removing. I just moved here from Dallas/Ft Worth and brought 3 tanks with live stock lol so I know how bad moving tanks are.