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Fittonia are very susceptible to damage from water sitting on the leaves when it is COLD, which I suspect it is since you moved it out of a warm tank. I'd remove the leaves you think have damage as soon as you notice them, in your conditions the melting leaves can cause other leaves to melt that it touches because the plant is not happy. If the plant is going to remain cool then don't let water sit on the leaves!

You need to look into the wet soil and drainage issue... especially if the plant is keep cool as this is idea for the entire plant to rot. If you bought the plant as a houseplant in the pot its really likely the substrate holds too much water because it's meant for low humidity as a houseplant where the substrate dries out fast. The higher the humidity, the less water your substrate should hold. I've had these guys grow practically as marsh plants in peat and water BUT the plant was warm and all it's stems were above the substrate (I just toss in cuttings and let them root, I never bury stems as that can cause rot that will kill the cutting). Fittonia grow quick when happy.

I've been having this issue with a bunch of plants lately as I moved a flat to the bottom shelf of my rack from a higher shelf... stupid me! They are all warmth lovers and the lack of heat coming off the lights below turned their condensation from nice warm water to cold enough to kill. A seedling heat mat under their tray solved the issue.
 
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