Looks Good!
Do you have a chiller?
I saw the water levels low so i figured you had one
Didnt see a filter, but im sure you have one.
The cave your going to have to replace, just a heads up.
I had the same one and my Axololt grew out of it in like 4 months.
Haha
Make sure you dont have to much sand, it can cause bubbles and gases form.
i think its no more than 1inch, not sure.
Other than that i love it!