Sweet Tee: yes, most of it is natural lighting. There is a 40 watt bulb but pennywort and water sprite covers most of the surface.

Whitedevil: It's just plain oxygen. That would be very neat though, to figure out how to co2 it up. and yes, there is a little bit of an algee problem, but it isn't bad.

beaslbob: thank you, i thought it was a little cluttered. We just used one bag of substrate on the whole 75 gallon tank.