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 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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