Back ground on a tank with external overflow box?

[nerdz]

Hello

I posted this in my build thread, but I thought it might have a better chance being answered here:

I painted the back side of my previous tank blue with tremclad paint.

With this new tank I cannot do this because of the external overflow, (You would see all plumbing).

What can I do?

Paint inside?

Or, maybe a better option, install acrylic in the tank on the waterside. Any tips? Where to buy in GVRD? 1/8" or 1/4" to help from bowing? Black or Blue?

Maybe mention another option I haven't even thought about!


I really have no experience and any advice would be great