I think that contrast would really make the aquarium really "pop" visually, but then again, I haven't bothered doing it myself because I'm lazy, lol. My suggestion is to try it out and if you don't like it, you can always take it off without much problem.
I like the smoke background as well. Gives it a dark effect, obviously. I've seen this window tint in home depot and lowes. Thinking about getting the frost version for my mini-m but it's like $25 or something. A bit steep , I don't need that much.