Hey Erik,

We switched from the 100g to the 210g in one long weekend. And they were sitting side by side, so moving to a new house would be more challenging. We did not use the old sand that came with the tank, but it sat empty for a week. We kept the rock going in water, and moved everything over from the old tank to the new tank, including as much of the old water was we could. Livestock went into buckets and tubs, everything in the old went into the new, new sand was used, the tank came with some rock and we reused our old rock, as much water we could salvage and then new salt water to make up the difference. Worked out fine with no cycle. Only lost a damsel and blue green chromis as the bag got accidentally crimped. So it can be done. Shout if you need help or supplies when the big time comes. We have tons of buckets, some tubs and even a 55 gallon drum you could use to make water in ahead of time (We don't use it and might be selling it soon). Exciting. -Mike