Ok, you pros may already have this but I just got (actually my hubby got them FOR me....ain't that sweet!) BOTH my tanks have timers on the lights! My 30 comes on in the morning & turns off in the evening. The one he found for my big tank is REAL neat. During the week (while we're at work) The lights come on in the morning I feed them & go to work, then mid day it turns them off and about time I return home it turns them on again & then off in the evening. So thru the middle part of the day they have natural light (but not direct sunlight). It is even set so the on weekends it's on more as I can watch them more then!
I just think that is soooooooooooo neat!

I can't help but grin in the evening while I am watching my favorite tv shows I hear CLICK & the tank lights go off!