hey guys, I'm currently setting up a low boy frag tank. It's going to be about 100 gal system. I wanted to put an ati fixture over it and was wondering if to go with a 4 or 6 bulb. The low boy is 10 inches tall and think a 6 bulb might be an overkill. Also at what height should I hang the lights and any bulb combinations you guys recommend for good growth. Thanks in advance!