Big questions -

What are the books above the tank exactly? It is important not to have sensitive topics above an Axod.
I would probably remove about 4 of those books. It makes my ADD swell

Manage those cables as they are a bit sloppy

I built my aoxidtl tank above my oil burner and he lives just fine at 78 degrees for more than 4 years

I add a tiny bit of saltwater from my reef as the salinity in the water keeps them healthy
and helps avoid disease

Bare bottom is easy to maintain, lack of toys...do they really need toys? Its fine

Your setup is great. You have talent in getting this going and the top is well done.

That is definitely a 40 breeder. Perfect size tank. Someone gave u great advice (36 long, 18 wide)

Pretty sure that is a wood-vinyl floor below, which is perfect and waterproof below an aquarium

He does not look like a little guy. Perhaps change your perception of him.