Terry's home made nano. NANO contest 2010. my unique tank.

[superduperwesman]

A lot of light fixtures are narrower than the tanks they're above but the reflectors typically fan the light out. So if the fixture is above the opening it should fan out enough by the time it's to the bottom. I do agree that there will prob be some gradient but nothing too drastic I doubt? If you go back to the pic you'll see that the little light about that tank fans out enough to light the entire bottom of the tank.