I used this and they did get stressed after a while. I replaced the visible barrier with one way glass and this fixed my problem.

@cosiso thank you, I'm glad you enjoy it! I put all the simple habitats up sans any enrichment because they sometimes show up as 'locked' for people using them in challenge modes, due to the research not having been completed on the animal in question yet. I can appreciate sometimes the animals do get stressed with the builds in habitat series, I didn't take into account how sometimes there can be too many guests about! As you say, putting up 2-way glass can help

I have placed this habitat and changed some walls, to make it more in line with my African-themed zoo. I love how "simple" you made this, as this means I can change some things, without getting frustrated about the small areas and difficult angles.
One thing I did get: the tortoises lacked food enrichment and toys. Not sure if that was intentional or not, but I decided to mention it at least. The other problem was that half my visitors were standing there, stressing the animals out. I solved it by replacing the barrier at the low areas with one-way glass.
Anyway: thanks for the hard work!