I have been doing a little more investigating on it.
Seems that the number of panels to power the entire tank (with MH lights being the killer) would cost way too much. I would have to run them for almost 10 years to break even.
Now, you can get a much smaller setup with only a few small panels that you can mount to a post in the ground (not messing up your roof) that connects to a smaller system for a backup power supply!! Powering the lights are out of the question, but I figured that I can run my return pump and my skimmer pump (aeration) for almost 72 hours off a single, large deep-cell. If it is sunny out (it least 1 our of every 3 days), then they could run indefinately. They could run durring the day off the solar as well!
So, using solar as a backup system makes a lot more sense to me both financially and for peice of mind!!
Of course, I would rater have a generator and run the entire house! The generator would cost less too......unless gas keeps going up!