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I'll answer here,no I never tested for yes I dose it through a wonderful product called Essential Elements from Kent.I use all kent products like the 2 part and kalk.
I add the elements every 2 weeks and I do notice the corals pop,the polyps on my efflo,montis and acans really stretch out when I add it.
So easy to say I like it.
brightwell makes a really good potassium supplement that I like to add. It is likely a coincidence, but as stated on the supplement, blue pigments seemed...well..more blue. and no I dont test for it (what's a test kit? ) I just half dose