I have a simple question. I want to get a new light fixture for my 29 gallon. It is 30" wide, so I'm assuming a setup that uses 24" bulbs. I fully understand lighting needs for various tanks, etc.. but what I can never seem to find is info on IF IT WILL FIT ON MY TANK! Some have bracket legs, will they adjust to fit my tank? How can I know? Any suggestions? I'll probably spend around $100, and don't want it to not fit.