Black crud on leaves and general plant sadness

My plants are mostly amazon swords, crypts, and so on, all with extensive root systems, all intertwined with huge branches and large rocks. I really can't remove them without just breaking down the tank. I might try dosing with Excel and/or introducing more panda garra. I suppose I could mostly drain the tank and do an Excel bomb, but I save that as a last resort.

It is the swords and the Java fern, especially, that are suffering from this stuff. The crypts, reinekki, and dward lilies seem to be free of it.

By the way, my small panda garra have been dying off over the past few months, though the big ones seem as healthy and robust as ever. I suspect they've been keeping this stuff under control. I'm not sure why the garra are dying; water quality is great. Perhaps they're just getting old (over 3 years)?
 

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