- they don't need much light
- they need tying to wood or rock (always)
- they grow slow so be patient
Too many hobbyists place them in the wrong position and this stresses them out. They are placed near the filter outlet or close to the light. If you want your anubias to dump their leaves pretty fast, just position them there.
Similarly, sometimes anubias will drop all their leaves which is rather frustrating. I's a bit like a snake shedding their skin, but in this case it's due to their new environment. If it's dramatically different from where they have been growing, then it might happen. Doesn't always but sometimes.
And this is my favourite anubias atm = what's yours?