The length of time to keep your lights will depend on the type of aquarium you have running. For a freshwater tank with just fish there really is no set time. Anywhere from 1-12 hours per day will be fine. If the tank is in an area where it gets lots of indirect sunlight or simply is a bright room you can keep the lights on for less time. If it is a very dark room you can keep the lights on longer. This will also hold true for a fish only saltwater tank.
Lawrence County, Illinois. Lawrence County is the easternmost county in the U.S. state of Illinois (excluding water boundaries). According to the 2010 census, it has a population of 16,833. Its county seat is Lawrenceville. Contents.
Sponsored Topics. Centreville is a city in St. Clair County, Illinois, United States of America. The population was 5,951 at the 2000 census. Centreville is located at 38Â°35â²4â³N 90Â°6â²14â³W / 38.58444Â°N 90.10389Â°W / 38.58444; -90.10389 (38.584583, -90.103768).