Adding Live Sand to an Established tank

[ensquire]

I may get corrected on this
But at the very least you are going to have to wash your sand out. The danger in stirring up an established sandbed is that you may release a lot of trapped gases.
I'm sure others will chime in on this. I'm in the same boat as you. I'm trading a tank into my setups and will be moving things between a couple of tanks.