This really is upsetting.
I used to own an emperor/imperial scorpion and he had at least 2 and a half foot of space, and that was tempory, this really is just cruel.
I wonder if you'd keep your fish in something so small?
Yes, these animals hide, but they need space to come out and search for food, and I can't believe you don't have a water source in there! I'm astounded you think theres nothing wrong with that!
These are the times I wish I could stick people in a box not much bigger than themselves for even just a week and ask them how it feels? The tanks only just big enough for the plant

At least if your going to keep him in something so cruely small, put something for him to hide in and climb on, make use of the tiny space he has?!?
Hopefully soon after that, you might put yourself in an animals shoes and think really hard about how you would feel living in something like this?
I feel so sorry for animals sometimes, I really do.