IMO, as long as you transfer your rock as fast as possible, in essence you're just doing a 50% WC. Now if you were transferring sand, that would be another issue. Should go very smoothly. Just don't keep the rock out of the water. Do your scaping in the tank when it's full. And I hope you have all the water made up ahead of time, or you may have salinity issues that you have probably already thought of.
Have fun with the new 8er
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