Well good luck with the diagnosis,,,,,, with anubias in my experience I've always found less is more at least with the water in my area, the tanks I have them in have low light and no ferts but with a decent amount of bio load and they do great,,,,, granted your water may be very different than mine, I basically have liquid rock and ammonia out of the tap........ I'm sure you'll figure it out, once they start flourishing ya can't beet the look of them.