Gary -
I have the Coralife 96watt quad PC fixture on my fuge right now. I like it much better than the old Lights of America fixture I had from Home Depot. What dimensions are you looking at for the fuge? Depth will play a factor in how effective PCs will be and the size of course also affects how many you can fit over it. With the 30gallon long the depth isn't a problem, just the width to allow for the lights. If it is a fuge only with no pumps and such in it you might be alright but once you put a couple of baffles in there or a sumberged pump, you start to limit what can be done.

Hope that helps, if not just tell me and I'll shut up! LOL :-)