Help me plan my 125gal aquarium

No problem at all.

My personal preference is to have a background in the fish tank. So I do not get distracted by objects behind it.

Keep the fish tank lightly stocked is a good idea. Less ammonia produced, less aquarium maintenance. It is easier to keep the water quality high without too many fish.

I also have the plan to set up an office at home. My plan is to have one of the fish tanks sit in a corner. Forming a triangle against the wall.