ok so weve been looking for bulbs for out aquarium. heres the problem the bulbs in out hood are 42 inches. we went to the hardware store to look for some daylight bulbs and all the fluorescent bulbs they had there go from 36 inches to 48. we can find anything in 42 inches. any ideas?? do we have a weird size bulb that we will have problems finding bulbs for all the time??