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When putting down and undergravel filter is there a way to keep a sand bottom from simply seeping through. Will this negate the whole purpose of the filter? And will it cause sand to enter the canister filters?

After hurricane Wilma, I had no power for about a week(after the generator failed) and everything in my tank died. I want to rebuild but am not sure what to do about the live rock. How do I go about cleaning it of the dead matter on and in it. Then, how do I re-cure it. I know it will take time...