So the person I tagged that responded is Michael Nash. He breeds them and knows them really well. If you go here
https://chameleonacademy.com/chameleon-academy-podcast-2021/ and in the search function of the podcast type in his name you will get podcasts he did with Bill Strand.
One thing to remember is you will always get people with their opinion... It is whether or not they actually defer to someone else with real hands on experience that matters. Ideally within the hobby we see an aquarium and it is a hard pass because it is drilled into us that it is not going to be ok. Listen to people that know there stuff when it comes to the species you want to work with. They are the ones I would go to.
I think it is always good to have air circulation. There are ways you could modify like placing a small pc fan on the top of the screen top to pull air up and out of the enclosure.
Just a heads up Pygmy chams are harder to find and get your hands on. Most of the breeders are currently working with one another to try to build a breeding community to get them established.
Search pygmy chams in the forum search function it will pull up a few threads that Michael was giving info in.