To Paint or Not to Paint?

[Enigma]

I'm not sure where to put this thread. Sorry if it is in the wrong place.

I was going to paint the back of our new display tank (40B). Hubby is opposed to the idea. We've really banged heads over this one. The disagreement is heated! He's getting very fired up about this tank (which is cool, as he hasn't once asked what the chiller, controller, and other stuff is costing).

Then I read this:
http://www.advancedaquarist.com/2012/5/equipment

Now I think that painting the back would be unwise, but I still don't want to be able to see though the back wall of the tank. I don't want to see the plumbing.

Comments and/or suggestions?