Lighting through a glass top?

[Matt]

Fish do jump, and many people have canopies or egg crate over their tank. Both those options allow for fairly open (sometimes fan-assisted) air flow. Putting glass over it will trap heat and limit oxygen exchange, and that's not so good. In addition, the salt splash and evap/condensation will (I'm guessing) make the glass opaque quite quickly, which will limit the effectiveness of your lights.