(Urgent) Advice: Is this suitable for a sulcata?

[Via Infinito]

I have this spare fish tank.
My sulcata is staying in my outdoor enclosure pretty much all day, this is only for when the night comes so he has a secure place to sleep ( predator proof)
It is around 1.5 years old and weight 480g
The only concern I have is the trapped air.
In Vietnam the night only dropped to 29 Celcius and the humidity is measured at a whooping 70% at night.
Is this a suitable place for my sulcata to sleep? Is the humidity too much?

 

[Tom]

Should be fine for those purposes, but it is too small for any sort of housing during the day.

 

[Taylor T.]

The humidity is good, it helps their shells grow smoothly. 29C is a good temperature for night.

I wouldn't worry about him running out of oxygen in one night, even if it was perfectly sealed.

 

[Yvonne G]

When a tortoise lives in an outdoor habitat, and only comes in at night or for the occasional bad weather day, it isn't necessary to have an indoor enclosure set up for him. Even a cardboard box will do.

 

[Via Infinito]

Thanks for your advice!
I think I'll go ahead and use it for his sleeping place