Again, its a matter of preference, but I tend to leave the side glass w/enuf space to clean. Some let the corraline grow on the sides. I did after the first couple of years with mine, then I let it go. Wished I had kept them clean after all after the buildup when I stopped.
Otherwise w/smaller tanks, that might not be as easy.
Still, looks nice.
On thought though, are your rocks seated on the bottom of the tank or just on top of the sand. If not on the glass bottom, be careful about not adding any livestock that will dig under them - pistol shrimp, some gobies, etc.
Another thing. I see the return in the upper right. Is that the only flow? If so, might wanna add a PH or two and make sure you've got no dead areas around the rock where food and waste just sit and collect.