low tech tank, no c02, how do plants grow?
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Old 01-01-2008, 10:40 PM   #1
shwerm601
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low tech tank, no c02, how do plants grow?


Anyone able to fill me in? I am not understanding the theory behind this... all these all natural low tech tank setups without a c02 addition and I do not get it. The fish cannot be providing enough c02 to compensate? Right?
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Old 01-01-2008, 11:13 PM   #2
surpera1
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under the right conditions you can strike a balance between fish , waste , light , water - it can be done



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Originally Posted by shwerm601 View Post
Anyone able to fill me in? I am not understanding the theory behind this... all these all natural low tech tank setups without a c02 addition and I do not get it. The fish cannot be providing enough c02 to compensate? Right?
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Old 01-01-2008, 11:32 PM   #3
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also co2 from the air is entering the water through the gas exchange at the surface.
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Old 01-02-2008, 12:10 AM   #4
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co2 is also generated by decomposition. bottom line, with low light tanks, there isn't enough photosynthetic energy available for them to take much, if any, advantage of CO2 injection. they grow slowly and use little CO2 and that apparently works.
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Old 01-02-2008, 03:30 PM   #5
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surpera1 love the avatar. I just had to share!!!!!!
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Old 01-02-2008, 03:40 PM   #6
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i'm glad you like it my fellow algae grower - but i must say that when things are right - some plants can grow like crazy in a low tech tank - i had it happen in a 40 long with water sprite and java fern - and i had plain gravel substrate - no heater - no co2 added - no fertilizer added - and 1 watt per gallon - it wasnt even a grow light - i even had carbon in my filter - though it was old and probably exhausted - i just got lucky i guess - i've been out of the aquarium hobby for 20 years now - but i'm learning a lot here and i have plans - hahahahahahaha - i'm gonna get something to grow other than algae - hahahaha
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Old 01-02-2008, 05:20 PM   #7
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They do grow just fine, like they do in CO2/Ferts/higher light enriched tanks.........they just grow SLOWER, it's all about the rate of growth.

There's still CO2(low), light(less), and ferts(little/less etc).
They are just limiting growth rates.

So it's all about the rate, that's why various methods work.
Some folks can handle slow rates of growth and want that, some like faster rates some like something in between.

Unless you have done each method, and measured uptake, growth rates etc, you will not see this similarity.

Regards,
Tom Barr
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Old 01-03-2008, 11:01 PM   #8
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plants in my non-co2, low light tank are stunted as well as slow growing. leaves on stems (h polysperma, r rotundifolia) are half the size of those in my higher light, co2, ei tank.

i've been adding a little kno3, kh2po4 and trace; helped growth and leaves seem to be a little more robust (but still stunted). guess i wasn't feeding my fish enough.
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Old 01-03-2008, 11:44 PM   #9
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Thats the whole point of a low tech tank...To keep yer hands out of it every week.

tc
Mark
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