Google ich and the life cycle there are phases were its not visible  
 
Setting up a treatment tank or tank transfer is actually supper easy 
Go on kijiji buy 2 20gallon tanks/used setups 2 hob filter and 2 air stones grab a bunch of PVC pipes from home hardwear and 2 heaters for the water, some prime for ammonia and one of those ammonia alert badges and there you have 2 full tanks for like 100$ tank. Do some research and put them threw the tank transfer method and your laughing then use it as Qt while the main tank is fallow for the time period 
		
	
		
		
		
		
			
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				Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC,  QT everything
			 
		
		
		
		
	
		
		
	
	
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