So for those of you who use a rack and tub caging system, how is it lit, and how important is adequate lighting? I'm building a shelf style rack that will be belly heated with flexwatt, and the long side of the tub facing out. Will enough natural light get in that way, or do I need to configure some other method of lighting? The shelfs will hold five 28qt sterlite tubs for some juveniles that I have/am getting. Thanks!