I read somewhere that holes in the leaves(if its not caused by fish,which yours doesn't look that way) can ce caused by too much nitrates.Have you checked for nitrates lately?
As for keeping the hygro, I have the same problem. I'm not sure if its because my water is like liquid rock.I've tried several times here in Az to no avail but when I lived in Oregon it grew like a weed. Ssame lighting, dosing regimenand roughly same fish load. the only thing different was water.
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