ok so i have a "Marineland" aquarium light on the top of my 55 gal bow and it's just not working anymore and i don't have a clue why. I have it hooked up to a timer but I've tried turning it on manual through the timer and on the light itself and neither works. Anyone have experience with these... i suspect the bulbs are bad but I'm not sure how to open the unit up and replace the bulbs. Has anyone ever done this and does it help?