I typically do 110g+ water changes at a time, filling 2 x 55g barrels to the top & usually mixing up a bit more. However, that takes care of the 165g, 60g 2' cube & RSM. Sometimes I will do a third barrel to give a bigger overall water change. 
 
BTW, just caught out a whole bunch of tangs, rabbitfish & wrasse from a friend's tank and we took out the rock, rather than drained the tank. 
		
	
		
		
		
		
			
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