I recently had a cory lay eggs, and decided to try to save some of them. I tried a few times but they never hatched. I was pretty sure these ones were. They hatched a week ago and are doing well. There's somewhere between 50-60 of them, and they've been doing well. All are eating well, and only a couple didn't make it the first few days. Since those losses, everyone else is doing well and growing.

I'd like to keep a bunch of them, but my 30 gallon isn't going to hold much more fish. I don't want to overcrowd.
I have multiple spare smaller tanks that can be set up, but I've also got this 40? 50? gallon terrarium that I used to use for a bearded dragon (it's a Zilla terrarium). I was curious if there's any way that terrarium could be used as an aquarium for some of the cory fry as they get bigger? I've heard the glass in terrariums tends to be thinner than in aquariums. If this is the case, can it be partially filled with water? Has anyone happened to have one of these particular terrariums and successfully used it as an aquarium?
If not, I'll likely try to sell it and buy a big aquarium instead. But it'd be much easier if I could reuse it. It's in really good condition too! Or set up one of the smaller tanks for a few of them and re-home the rest. I'm a member of a club full of people who would likely be more than happy to offer homes for them, but I'd definitely love to keep as many as I can first!
Thanks!
Edit: It's a Zilla, not a Zoomed.