Is this a bad idea?

[Aquattro]

So the new 180 is almost full, I hope to add salt tonight, and the rock I've had in a tub for a month will go in over the weekend.
So here's the dilema. Lots of the gear I need is on the 90. So my thought is to shut down sump, move over skimmer/reactor/zeo setup and maybe remove the 2 Tunzes from the 90 and replace with smaller pumps.
Now this will be for about 2 weeks, until I'm happy with the 180 and can start moving stuff over. Only 2 pieces of rock from the 90 will go, so 180 is mostly new with sort of seeded rock.
I plan an extra water change on the 90 while it's sumpless and skimmerless.

So what am I not thinking about here, that's going to make life difficult??