New Lighting schedule work AWESOME!!!
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New Lighting schedule work AWESOME!!!

This is a discussion on New Lighting schedule work AWESOME!!! within the Freshwater and Tropical Fish forums, part of the Freshwater Fish and Aquariums category; --> Hi Everyone, I've been trying an experiment with my lights with great success. I had an issue with hair alae so instead of leaving ...

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New Lighting schedule work AWESOME!!!
Old 12-26-2011, 08:16 PM   #1
 
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New Lighting schedule work AWESOME!!!

Hi Everyone,

I've been trying an experiment with my lights with great success. I had an issue with hair alae so instead of leaving my lights on for eight hours straight, I adjusted the lighting to nine hours as follows:

8 to 11 lighs on
11 to 1:30 lights off
1:30 to 4:30 light on
4:30 to 7:00 light off
7:00 to 10:00 lights on
rinse and repeat...

This cut back the hair algae alot and my plants have shown good growth. However, can this have a negative effect on the fish? So far, no signs of stress...
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Old 12-27-2011, 02:57 PM   #2
 
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That is a difficult question to answer. The siesta approach, which is what this on/off schedule is usually called, does tend to eliminate algae problems. It does this more because of the CO2 than the actual light, though they are connected. CO2 often runs out during the day as plants use it faster than it can be replaced, and when this occurs, the light is useless to the plants so algae takes advantage. The periods of darkness allow the CO2 to re-build, so when the light comes back on, there is again sufficient CO2 for the plants to photosynthesize.

Fish have an internal "body clock" just as we do, called the circadian rhythm, and it is driven by light and dark. We experience jet lag because of this; the difference in the 24-hour light/dark period is unbalanced when you cross several time zones, and your cells need time to adjust your "body clock." Fish have this too, but even greater. You can read more here:
http://www.tropicalfishkeeping.com/f...er-fish-81982/

I have not found any definitive data as to whether this "siesta" approach is or isn't affecting the fish somehow. This might be difficult to determine. In your situation, you have 3 "daylight" periods occurring each 24 hours, and that may be pushing the envelope. Two is more usual with this method, though even so I am not confident it is not without effect long-term.

Byron.
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