Tank Upgrade

[ickmagnet]

I'm planning on upgrading my tank soon to a 180 to 200+ . I am currently running a 120-130ish gallon tank ( don't have exact volume because it is a bowfront). I have various fish and some soft corals and was wondering, how would they fare during a transfer? I will probably do everything in one day. Also, I remember with my current tank ( a new set-up from 3 yrs ago), it took around 6-8 months before I could trust putting less hardy fish in there. I was planning on taking all of the water out of my tank and putting it in the new one and filling the rest of the new tank with RODI water. Will this off set the new-tank waiting period? Will it be just like my old tank running but bigger or will i have to wait a few months before adding my fish. I do not want to throw them back in and have them die. Of special concern is my powder blue who is thriving in my current setup but appears to be getting bored with the restricted swimming room. I have finally managed to keep one of these guys alive for an extended period and definitely do not want to jeopardize it.