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Windelov Java Fern Black Blotches?

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Can anyone diagnose this issue? I have some Windelov Java Ferns that don't seem to be doing well (see pics). The leaves have black blotches (not spots, but large blotches). I use Easy Green and recently started using Easy Iron, too. I dose in accordance with Aquarium Coop recommendations. I've even started to add a little bit more, just in case. My research tells me that it's a potassium deficiency, but wouldn't they get enough from the two ferts I'm already using or should I supplement with something like Flourish Potassium? Both plants in the pictures are attached to driftwood and not planted in the substrate. 




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