I also never was successful with growing Anubias emersed, same issues new leaves always dry out after a while and in all cases the plant stopped producing emerged leaves entirely. I'm still growing a bunch of Anubias very close to the surface and all rather stay submerged. It's a particularly tricky plant to get fully to transition and be happy in an emerged form in lower humidity. Failing in higher humidity might be temperature related, but that's a guess I don't actually know.
I'm running a project like this and tried to tackle it by not using soil but small chunks of pumice (Filter Lava) to provide sufficient cavities and some kind of circulation to prevent it from going anaerobic.
What species is this lily? :) This one... But then a very small cutting from its rhizome... That way it stays very small for a few years depending on fertilization and light cycle... This actually goes for any lily sp. with a Marliac or Tuberosa rhizome. Cut off a small young plantlet from...
www.ukaps.org
If you scroll to the start of the thread you'll see how it's build-up.
The lava chunks are covered with about an inch of lava based fine gravel and planted up. The house plants that do quite good in it is Cyprus alternifolius, Syngonium sp, Pachira aquatic, chamaedorea palm and the Mexican dwarf cyprus. The dwarf Cyprus struggled a bit for a few years but stayed alive and was finally establishing rather well. It also has a Cissus amazonica, but this plant is very light/temperature-sensitive for these conditions it always suffers in the winter and a lot dies off, but till now it always came back and grows relatively well during the summer. Fittonia even tho known to do good in tropical rainforest terrariums, is a questionable plant sp. for this setup, it's still alive but kinda suffering.
Plants that didn't like it till now are Begonia maculata unfortunately because it's a stunning plant, it's still alive actually but always suffering more dead than alive. The same goes for the Alocasia sp. zebra and several other Alocasias that didn't take it at all, tho it should be a good bog plant if enough light is provided. Most Peperomia sp. I tried didn't take it, but i guess that's because it actually is an epiphyte most epiphytes don't like it to wet.
Trail and error stand and fall with several factors and a major one is light and then temperature... I can't say in numbers such as Watts what is enough... I guess it all comes down to PAR I can not measure and most random lights don't provide these specs. More light and stay above 15°C will increase choices and success.