Photoperiod is too short? - The Planted Tank Forum
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post #1 of 17 (permalink) Old 01-12-2011, 05:11 PM Thread Starter
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Photoperiod is too short?

is it possible that im not giving my plant enough lighting time? my photoperiod is for only 3 hours a day. sometimes every other day. is there such thing as too short of a photoperiod?

thanks

Benedict
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post #2 of 17 (permalink) Old 01-12-2011, 06:12 PM
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Is it that short because otherwise you get algae? You could try raising the light fixtures or cutting the wattage and lengthening the period.


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post #3 of 17 (permalink) Old 01-12-2011, 06:12 PM
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Why so short? Why so random?
Just get a timer and set it for 8-10 hours.
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post #4 of 17 (permalink) Old 01-12-2011, 07:25 PM
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Your question would definitely be easier to answer if you explained why your lights are on for so little time and only on some days. I would imagine that yes, the photoperiod could be too short hindering the growth of your plants / their ability to survive. If, as houstonhobby asked, the reason is that you get algae otherwise, then I would suggest you think about one of the options houstonhobby suggested or another method that allows the plants more light per day. And a timer for the lights is definitely helpful.


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post #5 of 17 (permalink) Old 01-12-2011, 07:42 PM
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Why so short? Are you blasting a 5 gallon tank with 400 watts of metal halide or something?
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post #6 of 17 (permalink) Old 01-12-2011, 07:50 PM Thread Starter
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when i turn the lights+co2 on during the day, fish will start acting weird. they arent gasping for air but just not as active. co2 is at 30ppm(greenish yellow on the drop checker). algae is not my problem, my fish are. with the number of fish i have in there around 20 small-medium size fish, i dont use ferts anymore. i have to stress this that my fish ARE NOT gasping for air when the lights+CO2 are on, they just dont move too much. BUT even though i have surface agitation, they start gasping for air at night time when the lights and CO2 are OFF! they recover quickly once i put a airstone in there.

-i probably have too much CO2 during my photoperiod.
-my plants are taking in too much O2 at night. leaving nothing for fish.

Benedict
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post #7 of 17 (permalink) Old 01-12-2011, 08:11 PM
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Are you using 4dKH solution in the drop checker, or tank water? Also, greenish-yellow is probably more in the 40-50ppm range. Solid green, with a 4dKH solution, is 30ppm.
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post #8 of 17 (permalink) Old 01-12-2011, 09:33 PM Thread Starter
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im using the solution that came with the drop checker i got from aquaticmagic.

how about fish gasping for air at night time/light+co2 off? i would be nice to not run air anymore since i dont really like the bubbling sound that it creates.

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post #9 of 17 (permalink) Old 01-12-2011, 09:42 PM
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Plants do NOT take in o2, they do use oxygen but they get it from co2.
Are you using a canister filter or HOB?
If HOB, lower your water level for more oxygenation.
If you are pumpin in co2, but then never giving plants a photoperiod to use it, they are not oxygenating your water. Run the lights at a normal schedule without co2 for a few days.
Do a 10-20 percent water change.
When your fish return to acting normal slowly raise your co2 from zilch, dont go straight back to what you were pumping in. When I say slowly I mean 6+ hours between increments.
edit: actually plants get o2 by breaking down water molecules - dissolved oxygen in the water is of no interest to plants.


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post #10 of 17 (permalink) Old 01-13-2011, 01:17 AM
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Quote:
Originally Posted by Zareth View Post
Plants do NOT take in o2, they do use oxygen but they get it from co2.

edit: actually plants get o2 by breaking down water molecules - dissolved oxygen in the water is of no interest to plants.
What?!

Plants use oxygen. Plants also do not get oxygen by electrolysing water!

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post #11 of 17 (permalink) Old 01-17-2011, 05:45 AM Thread Starter
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im just going to keep the airstone in there at night just to be on the safe side.

anyway. so how long should lights be on if im trying to grow a nice carpet of tropica 049? is 10 hours too long? i do have other plants in there that are prone to getting algae like anubias and ferns. thats another reason i keep the photoperiod short.

ive been running the lights on for 10 hours the past couple of days and im thinking about cutting it back a few hours.

Benedict
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post #12 of 17 (permalink) Old 01-17-2011, 06:00 PM
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Cutting it down to 8 hours shouldn't be a problem. I would start with about 8 hours first.

Anthony


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post #13 of 17 (permalink) Old 01-17-2011, 07:10 PM
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Your certainly not getting 30+ppm of co2 in the tank if the solution from AM is not a 4dkh solution, any info on that would be very helpful. If it is a 4dkh solution, is there any way you can turn down the amount of co2 that is going into your tank (needle valve)?


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post #14 of 17 (permalink) Old 01-17-2011, 10:57 PM Thread Starter
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i turned the lights+co2 down to 8-9hours. i turned the co2 thats going on the tank down also(via needle valve). everything seem ok until the last couple of hours of the photoperiod. they arent gasping for air but breathing is starting to become abit heavy though. they snap out of it once the lights and co2 are off and the air pump kicks in. i wonder if there just isnt enough O2 in the water during my photoperiod? my plants also just started "pearling" today so im hoping that my plants pearling will help my fish's breathing. also if this counts for something, regardless of them breathing heavy the last couple of hours of my photoperiod. they will still beg for food and would still actually eat.

Benedict
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post #15 of 17 (permalink) Old 01-18-2011, 04:46 AM
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Hi gogreen,

Quote:
im using the solution that came with the drop checker i got from aquaticmagic.
+1 for bsmith comment. I use Aquatic Magic drop checkers as well, in fact I put together a "group buy" of 20 units for GSAS members last fall. The indicator solution from Aquatic Magic is fine, but you have to mix up your own 4.0 dKH water to fill the drop checker half way and then add 3-6 drops of the indicator solution.

The instuctions from Aquatic Magic are incorrect, they say "In the same invert postion, place some aquarium water into the tester (amount of water neeis is to fill up to half of the ball" which is wrong because your aquarium water could be almost any dKH. You are lucky you have not lost a tank full of fish.

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