I think you are right Drew, I better get it changed 
I have been using the Nutrafin test kit, but it does not seem very accurate. I am guess salifert is the best one to use?
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60 Gallon rimless, internal Herbie overflow, ATI Powermodule, Eheim 1250, 2X Tunze 6055, Tunze ATO, Euroreef RS100, Profilux controller, TLF Reactor.
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