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I could use some advice on locating a potassium additive for my plant
tanks.  I've been using Kent's micro nutrient product which does contain
some potassium, but I'd like to be able to dose it separately from the iron
and other nutrients.  At this time I'm not ready to go the full PMDD route.
Does anyone know of an off-the-shelf product (besides the $Amano$ one) that
contains only potassium?

Thanks, Ken Cova