I was also recommended that I dose with potassium, as some spotted the defficiency being related to it: holes in leaves, yellowing on the side and overall withering.
I will cut back on Flourish Excel to every other day instead of daily and also up my potassium dosing to 3 times a week as suggested on the bottle. So far I've been lax in both quantity and frequency. I am also thinking about pruning the affected leaves.
The only thing I can think of in relation to the BLACK algae showing up was me upping the Excel dose and an unforseen phosphate spike. Yes, I have a water softner but the only thing it does is changes my KH and GH from "ridiculously off the chart" to "I can live with this". My water is still hard with a pH of 8.4
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