I was wondering if I need one. The tank is in my room so I won't forgot to turn it off. In the mornings I'd want to see my fish before work and I leave around 9am. Then I'd like to watch them after I put my son to bed which is around 9 or 930pm. 1. Does the light need to be continuous throughout the day? 2. How many hours? 12 or more is too much isn't it? 3. Should I get a timer so I turns on after I leave work and then I can watch them after he goes to bed? My toddler is a handful so I won't get to enjoy the tank too much while he is up.