I recently acquired an old tank from a friend of mine. It is a 20 gallon hex (MFD 1996) which uses a 16" fluorescent light fixture. When I picked up the tank he said the bulb doesn't work anymore and I should get a new one, but the fixture itself works fine. So, today I went to my LFS and bought a colormax 15" 14w bulb. Looked great at first, except it wont turn on and its about 1/8" short on each side, any idea whats wrong? The original bulb was made by All Glass Aquarium, it reads 14w Aquarium lamp PREHEAT, Made in Germany. The fixture itself was made by All Glass Aquarium, it says 16" Fluorescent Aquarium Reflector 120 volt 40 watt 60 hz. I cannot find any info at all on the internet, due to its age I guess. Any info would be greatly appreciated!!! Thanks!