is it harmful to turn off the hood light at nite for the anemones? can they survive a nite w/o any light whatsoever? i would prefer not to leave my hood light on 24 hours a day if i dont have to. i use to leave my lights on only for about 6 hours a day for the fish. i plan to buy an anemone but if i have to leave my lights on 24 hrs a day with a 120W bulb i dont think its too efficient for me.