Shutting power off on a tank?

[kien]

When I had to move my 90 gallon in order to upgrade to the 150 gallon I had all my fish and coral sitting in a tupperware tub with a couple of powerheads (koralia 4s, and a heater). That's all they had for a whole day and they were all fine. No light for a day isn't a big deal because that's just like a stormy cloudy day. So I would say heat and flow are the two key items. Don't really need the return pump if you just put the heater in the display tank near one of the powerheads.