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Looks like a phosphate deficiency to me, leaves that are deficient in phosphate grow darker than normal. The leaves also look a little wrinkled, that could be a calcium deficiency, and keep in mind that calcium and magnesium work hand in hand.

Crypts are heavy root feeders, require heavy root ...

Here are some photos, I see your point about the Iron. I've been thinking about that too, but I figured if I overdosed on iron I'd have algae issues, and I really don't have much algae at all. My substrate is inert, it's fluxx, so I got the root tabs for my crypts since they're heavy root feeders. I ...

It's common for C. W. leaves to rot when added to a new aquarium - new water conditions can be a shock.

Ohh okay, thx, how long does recovery usually take?

My plant's turning black and getting all rough, like that pic I found online. I'm curious if this is normal or not.

I've got sand substrate with Seachem Flourish, API Leaf Zone, and Seachem Root Tabs - been working great until now. My other plants - Red Leaf Ludwigia, Twisted Leaf Valisneria, and ...