I think it would look badass if you did go black on black. Your rhom's sparkle stands out more. I remember you have a black rhom with some sparkle on it (looks like a diamond rhom). Just my personal taste.I got black gravel in my 75, and was thinking about painting the backround , but a black back round with black gravel wouldnt look to good. any body got pics of a dark blue or of thier tanks with a diff color backround?