Quick question Sunny,
I am cooking about 75 lbs of live rock in a 35 gallon tub since July 1, 2009. I am thinking about taking another 30-40 lbs of live rock out of my current system (running about 90lbs) to make a more open aquascaping for my corals to grow into. I am also running a 1 1/2 inch sand bed right now that I plan on upgrading to a deep sand bed ~4 inches.
Lets say I took all the rock out of my system and placed it into a tub for temporary holding. I then added another 40-60 lbs of sand (cleaned dead sand or live) I left all corals and frags in my system, except for the ones attached to the large pieces of rock themselves (a few zoas ect.)
Would I do any harm in doing so? I would only put back around 50lbs of the nicer live rock and the rest will go into the cooking tub. I am cooking that rock for my upgrade that I am planning. Not sure on how big we are going, probably a 60"x24"x25" Oceanic Starfire Reef Ready. I plan on cooking the rock in that tub for at least three months then till I get my new system. Water changes will be done periodically on the cooking tub. I have a mix of Tonga branch, nice Fiji and my favorite Bali. I'm sure I have some other nice rock mixed in too

Am I correct in, the longer you cook the rock, the better? Will all bad algae's die in the cooking tub and I will not re-introduce them to my new system?
So on the issue of removing the live rock, placing the new sand in, and then putting the rock back into the tank. Besides stirring up some detritus, will I do any harm to the tank? Tank has been up and running for just under 2 1/2 months now since my move. I will keep the flow off while removing the rocks and adding the sand.
I will turn the flow back to full throttle after I scrubbed and dunked the rock I plan on re-using in tank water. I will then let the system settle for an hour or so with a wet skim setting, some mechanical filtration and full throttle flow before I place the rock back into the tank and attempt another design. What do you think? I have noticed that my 75 gallon is currently too small for all my frags (don't have any colonies yet, still growing

) and we need to make some changes before our system matures too much. Thanks Sonny.
-Chris / Katie