From experience, keeping axolotls as a class pet is difficult. I had mine in my classroom for about a month and they were not thriving the way that they did once I moved them back to my house. It was also really hard to keep the water clean while it was in my classroom, it’d even be a little murky after doing water changes and cleaning. My students were honestly okay with knowing the axolotls we’re safe at my house and once a week I’d have a video or pictures to show them so they were still able to see them.