Java fern and Anubias are pretty much indestructible, although it might take a few weeks before your Anubias starts doing anything since some types are very
Also, I couldn't tell from the picture, but you need to make sure that the rhizome of both plants isn't buried in the substrate. Only the roots should be buried otherwise the plant will rot and die.
I think a couple more Java fern or some Java Moss/Anubias tied to driftwood would look nice, and give him a few more places to explore and some nice little resting/hiding spots.
Haha, already got beaten to the punch!