- 1). Read your light fixture's manual. Get to know the details of your aquarium lights, especially where the switch is located.
- 2). Determine how the long the aquarium has been lighted to see if it is time to turn the lights off. Keep a regular schedule that will track when you will turn the aquarium lights on. This will ensure that your fish have a regular day and night cycle. Keep the lights on for 12 hours and keep them shut for the next 12.
- 3). Locate the switch of your light fixture and turn the lights off.
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