"Siesta" a.k.a 2 photoperiods - Page 3
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Old 01-17-2013, 09:32 PM   #31
Steve001
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Originally Posted by TexasCichlid View Post
Do you keep your CO2 going during the siesta?
I have an open top tank and run the co2 non stop. I've been doing that for over two decades. Light also varies because most of the lighting is natural with some supplemented lighting. During the Spring-early Fall it's all natural lighting. Not once have I had a problem with co2 gassing of fauna. The key here, may be do to co2 having an easy way to escape in contrast to a closed topped tank.
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Old 01-17-2013, 10:54 PM   #32
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Prior to running my tanks with a 3 hour siesta - lights on at 7:30, and off for the night at 20:00 - I had green spot algae growth giving me spots of about 3 to 4 mm in diameter every week. Thus, scraping spots on Saturday, in between other regular maintenance tasks, only to have the 3 to 4 mm spots growing back by the next weekend.
Then, reading that a break in lighting regime could interfere with the algal cell cycle - which requires 6 to 8 hours to complete - I decided to implement a siesta. So I set it at: lights on at 7:30, off at 12:00, on at 15:00 and off for the night at 20:30.
Since then the number of spots decreased noticeably, and their diameters never exceed 2 mm. This reduced maintenance significantly. Also the growth of other algal species - hair alga, black beard and the common green furry algae - decreased. This then also reduced the requirement for chemical control - spot treatments with either hydrogen peroxide or excel.
And I had no ill effects on fish or inverts yet.
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Old 01-19-2013, 11:25 AM   #33
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This thread has me thinking about doing a small experiment. Not really an "experiment", since I can't set up very many tanks, but I was thinking about the possibility of setting up 3 identical 5 or 10-gallon tanks -- same substrate, same plant species, one type of fish, same dosing regime (if any), same feeding schedule, etc.) -- but have 3 different lighting schemes. The control tank would run a standard 12-hour photo period from 7 to 7. The other 2 tanks would run split photo periods (4 on, 4 off, 4 on, starting at 7 am), but one would be in a dimly lit room, and one would be in a brightly lit room.

The purpose would be to observe the rate of plant growth, algae growth, and fish behavior. Anyone have any thoughts on how to measure/describe these things? Especially "fish behavior". And if you have any thoughts about the design of the experiment I'd be interested to hear them. Might need to do a separate thread....
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Old 01-19-2013, 05:24 PM   #34
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That's a great idea. if you had 6 tanks and just 2 treatments you could do a t-test. Just do a 6+6 siesta vs a 12 hour photoperiod. For the sake of the experiment I would start with no co2, you could run a second experiment afterwards with co2 in all the tanks, or maybe excel. If you have a small scale that would help.

For response variables-You could measure plant weight, or plant height. Riccia is a good one for plant weight, or some java moss. Have a single crypt of the same species in each tank, weigh or measure them before and after. Also a stem plant would be good to include. Something easy and fast growing to get clear results. You could also count leaves on the crypts or swords. Fish would be much more difficult. If the tanks were large enough, guppy colonies would be hard to beat. Their population size after a few months would be a good indicator, as would their weight if you had a fine scale to weigh them. Algae would also be very hard to quantify. You might be able to quantify the % coverage on the glass or something like that, but I think it would end up being more like a subjective thing. Maybe for BBA you could count the number of threads on all your plant leaves? That would be pretty solid.
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Old 01-20-2013, 02:38 PM   #35
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Quote:
Originally Posted by james1542 View Post
That's a great idea. if you had 6 tanks and just 2 treatments you could do a t-test. Just do a 6+6 siesta vs a 12 hour photoperiod. For the sake of the experiment I would start with no co2, you could run a second experiment afterwards with co2 in all the tanks, or maybe excel. If you have a small scale that would help.

For response variables-You could measure plant weight, or plant height. Riccia is a good one for plant weight, or some java moss. Have a single crypt of the same species in each tank, weigh or measure them before and after. Also a stem plant would be good to include. Something easy and fast growing to get clear results. You could also count leaves on the crypts or swords. Fish would be much more difficult. If the tanks were large enough, guppy colonies would be hard to beat. Their population size after a few months would be a good indicator, as would their weight if you had a fine scale to weigh them. Algae would also be very hard to quantify. You might be able to quantify the % coverage on the glass or something like that, but I think it would end up being more like a subjective thing. Maybe for BBA you could count the number of threads on all your plant leaves? That would be pretty solid.
Thanks, hadn't thought about the statistical analysis but a t-test makes sense. What do you mean by a 6+6 siesta, though? 6 on, 6 off, 6 on, 6 off?

I would keep the plant species to one so that interactions among plants aren't an issue (for example, one taking up more nutrients than the other).

I like the idea of guppies/population size for measuring the fish, but that could get tricky if you happen to throw in, say, 3 females that are on the verge of having babies in one tank versus 3 that just had babies. Instead of total population size I guess you could instead count how many fry are born, how many survive, etc., although from experience it's kinda hard counting all those little things!

What about fish behavior? What would be a less-subjective way to describe that? I'm curious to know if the split photo period stresses the fish, so I'm wondering if there are specific behaviors to observe.
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