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					Originally Posted by  lpsreefer
					 
				 
				The only thing the new sand with do is make ur water cloudy for a while. As long as you seed the new sand with ur old sand.  
And use ur old water. You won't have any cycle. 
Here how I would do it. 
Put the new sand into the new tank. 
Do a regular water change on ur two smaller systems. 
The water you take out put into ur new system. I would do 50%. 
Then add all your rock/ coral and fish over. 
Since it not a new setup. 
Ur using two smaller one into one big one I would even worry all that much. 
New sand is good! Just a cup of sand from ur other system to seed and ur golden. 
			
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 +1.  I have done this exact process with the exception of the sand, which is one step better then what I did (reuse but thoroughly clean old sand).  Only thing I would suggest to be careful if is not leaving the new tank with all new water for a while.  You might have it cycle on you and if you transition stuff over mid cycle it could get bad.
Dan