i have recently started to have a problem with my light in my aquarium. the problem started about 3 weeks ago when one morning when i flicked the switch on the light, it didnt come on. at first i though the tube had gone but after i flicked the switch a few times the light came on but recently the problem has gotten worse. it seems like everyday i have to take the hood off an mess around to get the light to come on. the weird part is that the light works when i take the hood off and put it on my bed to have a look at it but when i put it back on the tank nothing comes on!?! i have the light pluged into a dimmer so i can adjust how much light is given out, could the dimmer be causing the problem or is it a case of replacing the tube or anything else?