What size tank did you move that you could keep the sand and some water in there? 
 
Consider that when you move a tank, you are no longer applying even pressure along the bottom of the tank, you are risking busting a seam whenever you move a tank, and that is more likely if you leave a hundred+ pounds in it, plus it becomes much heavier to move. 
 
Your call though of course, let us know how it works out, depends on how deep the sandbed is too. 
 
I would remove the sand, and rinse 80% of it heavily to get rid of the detrius.  save 20% to re-populate the loss of life in the rest of the sandbed. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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