Thanks Scott, Jack, Craig.
Brooks, the lights aren't exactly on the same time schedule, they're different by about a minute. Cloud cover is emulated on the individual lights timer. And it also could be that most of the rock on the right is the new rock and doesn't have any coraline growing on it yet, so it looks more bleached and looks brighter. The left side has most of the rock from the 120g.
Sometimes the left looks brighter than the right though too.
