Hi Marlin,
Curious to know what Potassium(K+) supplement you are dosing, as it should not cause an algae film on the panes.
I dose as Myka, K-Balance Strong, just different quantity(325 net), and I do not get any film on my panes. My levels stay in the 380-400 range.
I think some may be confusing Potassium Iodide Fluoride(PIF) with raising levels of K+ in the water column; this will not work, as PIF is mainly used as a colour enhancer(blue), not to raise K+.
The KZ K+ test can be a little confusing, but the more you use it the easier it is to read; the cloudier the sample the higher the concentration of K+.
HTH
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