frosted glass

Would applying a frosted film or spray paint to the rear wall of my new AIO tank look good? It’s glass with a black film, so I’d be doing a white frosted surface if I did it. Also, does anyone know of a safe paint to use for aquariums?

I am in the planning stages of an in-wall aquarium in a common wall between my office and family room. The idea is to have it flush on the family side and be maintained/viewable from office. I'm toying with the idea of adding privacy glass or smart tint to both the display sides so I can...