do you scoop up the sand in the existing tank and transfer it to the new tank? i am going to be moving this year and i want to get a headstart on it. right now i have an external overflow, so i am buying another 20H (same as i have now) next week and going to have it drilled for when i do move because i don't want the one i have now taking up that valuable space in the tank. that way, when i get the new tank all set up in the new place all i have to do is transfer the water, fish, and rock. will not using that existing sand cause a cycle? how should i go about doing so? basically, i want to have another RR tank set up in the new place and transfer everything over to the new one. tnaks you so much for your help and concern!