I have just 3 varieties in here. Just A. Bateri, A. Nana, and A. Nana "Gold"How many species....Nice, I am an anubia fan. Especially mature established specimens. Just wish they had faster growth.
Are they rotting at the rhizome? I had an outbreak of Anubias Rot on my A. Petites. I lost 4 plants and the others just didn't grow back as nice. If your rhizome turns brown, loosing leaves, and the rhizome is turning to mush, cut it off or it'll affect the whole tank.Fantastic display, count me in as an anubias fan too; I used to have a lot of it similar to you, but recent specimens have been wasting away etc