Whilst changing the water in my reservoir, I noticed some of the leaves on my Fatali plant were curling. This is what I found on the backside of the curled leaves.
I beseech ye sages of pestilence, what is murdering my plant?
Yeah... some of my plants have it too. Just watch how often you water. I noticed the plants that have it worst had a little root dieback too, again suggesting overwatering. Put a fan on them to get air circulating, and hope for the best.
Edema. I had it a lot worse than that on a few of my plants. It went away in a few days when I stopped watering until they wilted an got more air moving around them. More oxygen and less water helped me.