We have a group of 4.1 Bakhuis. I know the moss looks great, but Bakhuis love larger leaf litter and lots of it. The more you have the more you will see them. Picture a forest floor. Lots of sticks, debris and leaf litter.
The viv looks good. As others have pointed out, the more leaf litter, the more safe the frogs will feel. You could also try taking a few cuttings of the Selaginella and other plant from the wall and planting them on the ground. The more plants, the safer the frogs will feel as well.
Good luck with the Bakhuis, they are a great little tintorius! Richard.