Sorry to bump this, but I'm still having this issue and having a heck of a time figuring out what's going on. The other plants in my tank are flourishing, and the anubias leaves look very healthy, but this curling is annoying. I took the recommendation of a few people and put the anubias under some shade (the sword) so it doesn't get direct light, but it still does this. Currently, my tank:
28 watts over 10g (tank about 2 months old)
30ppm CO2 (drop checker)
Flourite substrate (about a month old)
EI dosing with:
1/8 tsp KNO3
1/16 tsp KH2PO4
1/16 tsp KSO4
2 mL of Flourish on off days
2 Flourish tabs
Nitrates stay at a constant 15 ppm, dunno about rest, 50% water change weekly with light gravel vacuuming.
Pic of anubias (and a snail, lol)
