Paint for the back of the tank?

[OCDP]

Blue is nice because (especially if you have halides) you can really see the shimmer on the back glass, which gives it a nice effect. I've never used black, but have seen it, and it just seems to dull... too dark basically haha. The blue adds a lot of energy, and in a way it just gives off more of an ocean feel with the blue backround. All my opinion of course.