I started not too long ago with a 29 gallon biocube.. it isn't as hard as you may think.. as long as you take your time... 
 
I will be doing the same with a 90 gallon that i have (converting from fresh to salt..) 
 
I'm probably going to get the sand in with some LR and just let it sit for a few months.. then once you get used to it.. you'll (I'll) add more and more... 
		
	
		
		
		
		
		
	
		
		
	
	
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