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Old 07-22-2013, 12:10 PM   #1 
Graceful
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How long should I leave the aquarium lights on?

My dad usually turns on the aquarium lights at around 6 AM. I end up turning them off at around 8-10 PM. Is this too long?
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Old 07-22-2013, 12:18 PM   #2 
shannonpwns
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I usually stay around 11-12 hours of light on, maybe get a timer? But I dunno if those extra few hours will hurt anything.
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Old 07-22-2013, 12:28 PM   #3 
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For some people, leaving their tank light on too long will cause an excess grow of algae. This happened to my tank and to take care of the algae outbreak I began leaving the light on 4 hrs, off 4 hours, and back on for 4 more hours. The algae problem has been eliminated and I have switched back to leaving it on for 7-8hrs per day.
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Old 07-22-2013, 12:34 PM   #4 
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I have no algae whatsoever, surprisingly. I do have five snails, though. So maybe they're just eating it faster than it can grow.
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Old 07-22-2013, 12:39 PM   #5 
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I leave my light on longer bc I have nerites who gobble up the algae. Make sure there's enough get-away for the betta who might prefer a dark space here and there though.
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Old 07-23-2013, 12:37 AM   #6 
Lucubration
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I have my light on from 8am to noon, then 5pm to 11pm. That way algae doesn't get out of hand and I get to enjoy the lit tank!
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Old 07-28-2013, 12:59 AM   #7 
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I have my lights on from ~10AM to ~8PM. I had them on for an hour longer and had a minor algae (brown, diatom) problem. I decided to play with the lights to see what happens. I reduced the time by a 1/4 hour at a time until I'm at the current time. The amount of algae reduced in concert w/ the reduction of time for the lights.

BTW the lights are 48 W of T5HO lights on a 29 gal tank.
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