Tomorrow I will be upgrading my tank from a 45 to 75... I only have 4 inhabitants in my 45: 2 clowns one watchman goby and a pistol. I also have some snails and hermits. The tank I am getting is keeping the sandbed in it, and the person has only used ro di from the beginning. I want to place my current sand bed in there as well, so that I can have a 4 inch sand bed across the entire tank. How should I go about doing this? Do I need to let any die off occur on the tank that I am purchasing? It will only have a little bit of water when transporting it. Should I expect any ammonia spikes? Like I said his sand will not be mixed up much, but mine will (my tank has only been set up about a month and a half so the sand bed shouldnt be to bad). I am going to keep the inhabitants all in a 10 gallon while transporting and the inverts in another container.