Cycle question

[Aquattro]

If it were me, I'd use almost all new water in the new tank and use the old one as a rinse for the rock as it comes out. Really swish it around to loosen any crud built up. The whole keep it wet pretty much means don't let it dry out for a couple hours. Don't be afraid to stack it in a bucket for 20 minutes while you figure which piece is going where.