Yupper!
That is a tank within a thank. I recently fabricated the smaller tank. But instead of drilling holes into the acrylic, i decided to lower the sides. Thus leaving a gap to allow air flow. Right now i'm just testing it to determine if the stenos can escape. I doubt it though. As shown below:
The outer tank is much larger. It's actually for two newly aquired crested geckos. Btw, it's not done yet. I'm waiting for the "top" panel to be fabricated.
"top" is actually the front of the tank. the tank is currently on it's "back"