My Anubia barteri var. nana's leaves have started to curl pretty dramatically on the edges giving them a ruffled look. The change happened almost overnight. The edges were smooth when I checked the tank last night. The leaves are still nice and green.
It's a small (3-4 inch tall) plant in a low-light no CO2 tank. Is this normal or should I be concerned?
In fact there is nothing wrong with the plant and those little curling you have mentioned is totaly normal for barteris. BTW I would consider adding some Fe and/or Mg to your tank, I can not be sure as I do not know your dosing regime or water parameters if there is any. Some light color and yellowish/brownish damaging are main indications of their defficiencies.
I have chased this issue for some time in my tanks too. I have tried adding calcium chloride despite having a GH of 5-8 depending on the time of the year. They still curl just like yours. The only tank that I have that they do not do this is the low light tank. They actually grow much nicer and even flower. The only thing that seems to have helped a little was changing water conditioners from Prime to Amquel. Potassium dosing seems to help too.
anubia barteri nana leaves curling? 
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