Red slime treatment is not like an ATM.  It's not an instant remedy.   
 
 
If you read it says more than one treatment may necessary... Along with a water change at x days.    And yes... Turn off the skimmer  It removes it.   
 
I used it along with manually removing and it took 6 weeks.   
 
I think you have an issue you have yet to identify.  Everyone claims their tank parameters are good... But something you are doing is causing the cyano.   
 
A well maintained tank usually has controllable algae.   
 
Good luck. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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