Thanks for the quick answer.

I've only had them about three days. I have one 24" 17 watt fluorescent that came with the hood and an 18" 15 watt light called "flora gro" or something like that to help the plants. The filter is an Aqua-Clear that returns water to the surface. It creates a small bubble stream (less than two inches) under the water since it is on the low setting. The tank is about 78.