I need some advice here from your aquarium excperts, i bought a tank about 1year ago, and last week the UV bulb died (r i thought), so after all the trouble of finding a replacment bulb, i put it in and.....it still didnt work, now im not sure what i should do the tank has been without light for about 1 week now its only a small tank, i think the switch on the lid of the tank has gone but im not sure, is they anyother way i can get a UV light like some external one, the tank is only a small 13gallon hexagonol one with some electrics in the lid for light and pump to work..now im stumped i dont know what to do i cant leave the tank in darkness. :help: