Now about the spot light. I have seen a few videos on youtube of peoples tanks with the shimmer effect. So I decided to create that with my tank. There are several different ways to get the effect but two things are key. 1. Surface water movement (ripples) and 2. point source light.
To do this in my tank I used a bayco clamp work light fixture with a Utilitech Pro PAR20 450 Lumens 3000K LED bulb pointed at an angle at the surface of the tank. I would have got a 5000K bulb but they didnt have any at the store. This will be something I get in the future.
So here is the result http://youtu.be/cRHerto8kX0