I also have a PC light fixture that I purchased from AD for my fuge that I no longer use. Playing with an idea here in a few months so I don't want to sell it but you're welcome to borrow it now.

It's not big, I think a twelve inch pc that clips over the side of a tank by two legs that can be moved out to thirteen inches side by side. It has a pc bulb in it (half blue half white) that I ran over my fuge for a number of months before learning macro, like me, prefers Home Depot bulbs.