Join Date: Apr 2005
Location: Australia, Brisbane
I do not think it will be too bad at all if the light is not intense. I turn my lights off at about 9 pm each night, but we have other light in the house on for about another 2 hours after this what are in the same room as the tank. The fish seem to settle down quite quick after I turn the tank lights off and plants start to photosynthsyse really quick so I would say no, it is ok to do what you are doing.