Both tanks run a 12 hour cycle, gradual increase/decrease. A small red night-lite in 60g canopy and a conveniently located streetlight outside gives the 90g a "simulated" moonlight glow...
I read somewhere that "strange people" become more active during the full moon cycle. Fortunately Ross has dismissed that theory...
I wonder if the city would consider synchronizing that street light with moon cycles :? I'm afraid to ask.
I think I know where you're goin' with this one so I'm probably not included in the 12 required responses...