I don't think you can store LR. It wouln't be live anymore, it would still be usefull as base rock in the future IMO. I personally would think you would be better off selling it (live rock is worth more than base rock) Sorry to hear you are shutting down. Could you not go Nanno? If you are short of space, a 10 gallon doesn't use much room 
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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