I enjoyed reading Shadeflower's counter theory about potassium and algae. Excessive and/or missing nutrients can surely create funky results, especially with algae growth. Heck ~ put a clear glass (filled with distilled H2O without any additional nutrients added at all) near a window. Give it light and see what happens over the course of time... greenish?
I hesitate mentioning anything about fertilizers, because I know it will open-up a can of worms real quick. I think most orchid growers know that it's all about finding that balanced *sweet spot* (what works best for their plants).
Personally, in regards to fertilizer, I'm from the 'K-heavy' school. Excess K may very well *not* be necessary, or needed, for orchids. I do use a higher percentage of the macro-nutrient "K" in my fertilizer. I've also used 'K-lite'. No scientific data from my end ~ just personal observation and a lot of time. Have not noticed much of a difference from using either one, light or heavy (heavy: meaning a minimum of 20% in my formulation). But, I do know my "heavier potassium % ratio formula" has produced better plants that seem to be more resilient and robust for me [putting an emphasis on "me", and just my opinion for what it's worth].
I figure that an excess of that macro-nutrient (K) has helped, and has not been harmful. I know potassium can add with the benefit of increasing photosynthesis capacity, and can help aid with the absorption of nitrates, along with other positives. It all boils down to finding 'the balance' that works for you and your orchids.
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