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cycling when upgrading
Moving all the water will not be as important as the other items as the majority of the bacteria live on porous surfaces (such as filter media) and not in the water column. Adding as much "temporary" gravel as you can will help. You should be alright by transferring the rock and all the filter media you already have established. Your bio-load will not increase as long as you don't add a bunch of fish immediately after setting up the new tank. Add fish slowly as you would to any new tank and you should be fine.
Your bioload is determined by the number of fish you have in your tank not the amount of water. If you want to increase your bioload quicker think about getting recently used media for your second fluval 405 when you set it up.
Not checked for facts.
There is a very fine line between fishing and standing on the shore looking like an idiot--Steven Wright