@Sallstrom (and others, of course)...
What about painting that black back area/overflows/dry chamber a darker blue?
Realistically, with the amount of rock I have, and building other lighter structures to get toward the top, I would only paint the top half.
This would be painting the
inside of the tank. Possible? I was also thinking about just getting some blue acrylic panels cut to fit that space.
It really doesn’t take a lot of blue to make the tank pop. Here’s a softie tank I do...very little of the blue back shows, but what little does really adds a lot, especially when you can see the reflection on the underneath side of the water surface.