when I bought my tank off cl
, I regret keeping any of the existing water, it was high in nitrates, really high. The water does not keep any bacteria, its in the rocks and filter media. You will need to rinse the sand thoroughly to avoid releasing nitrates into the new water. Someone on here had a method of using a pillow cover and pouring saltwater through it to rinse the sand (good way to use the old water that you transport the rocks and livestock in). Mix up new water Friday so that it has time to settle or get the tank home, rinse the sand, put the water in mix it in there overnight without any livestock or rock in there at all, then once it has come up to the correct temp and you have your salinity correct, add the live rock, sand, and then drip acclimate the fish.
It was a lot of work, but well worth the effort. I didn't keep any of the sand, put in over 100lbs of new sand for a deep sand bed (dsb
), kept the rock and unfortunately some of the water, and had no cycle at all. I kept the live stock and rocks in a rubbermaid container as I picked them up three days before the tank because I didn't want to worry about anyone dying on me on the day of moving the tank. Maybe you could go do that Friday, get the fish and rock in rubbermaid containers. If you do, you have to keep the water moving with a power head and a heater. Good luck!!!