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Small scale planted tank

This is a discussion on Small scale planted tank within the Beginner Planted Aquarium forums, part of the Beginner Freshwater Aquarium category; --> I pulled a cup of water out of the jug, end of the day so minimum CO2 content relative to the morning anyway. Measured ...

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Small scale planted tank
Old 03-29-2013, 04:09 PM   #21
JDM
 
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I pulled a cup of water out of the jug, end of the day so minimum CO2 content relative to the morning anyway.

Measured the pH. Kept the vial.

I manually bubbled it a bit, just used a turkey baster, and let it sit for an hour or two.

Re-measured the pH and could easily see a lightening of the colour in a side by side comparison. It was not a full 0.2 but discernable.

My conclusion was that CO2 had essentially "in gassed" without being forced to with massive bubbling, I got tired of bubbling manually after about 30 seconds.

CO2 can't be lighter than O2, it just plain has more parts to it. In air, CO2 is close enough to the same density that it is mostly evenly dispersed unless you put it in a very controlled environment. In a tank there could be more CO2 at the bottom, which is why some feel concerned about their bottom dwellers, or any fish that go to ground to sleep at night while the CO2 is building up. With any filtration providing any circulation this is not really a concern.

In gassing and out gassing between water and air has more to do with the partial pressures involved and the affinity of water to absorb different gases to various levels of saturation. Ammonia can get as high as 500,000 ppm in water if the water is exposed to a pure ammonia source, CO2 is 1,500 ppm and O2 is around 40ppm from air... Pure O2 might be as high as 200ppm to compare against the pure CO2 source. Water has a higher affinity for CO2 absorption than O2 but oxygen makes up about 20% of the air while CO2 is less than 1% by volume (0.03% from one source) so there is just far less of it to capture even though it is easier than O2.

Jeff.
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Old 04-03-2013, 09:06 AM   #22
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Java fern seems to be doing well. This is a shot of the very diminutive fern leaves on the piece of rhizome that I plopped into the jug project. It started out with one small leaf and now has two. I moved it up so the leaves are at the water surface as I might see how they do semi emmersed.

Oh, that little bubble of goo looks like about 6 snail eggs clustered together. I thought I had a snail in there already, now, with no fish, I'll have some more.

I suspect that my eggshell experiment did not work, and perhaps I shouldn't be surprised really, but I will retest maybe today and see where everything is. If nothing else it showed that I can supplement the KH without affecting the GH which could work to provide a pH buffer in cases where it may not be desirous to raise both GH with the KH to do so.

Jeff.
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Old 04-14-2013, 11:56 AM   #23
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Just had this little stem vase, or whatever it was, sitting around and thought I might just tuck a stem in there and see what it does. This stem was just floating in the tank and the end was already out of the water, so I cut to about the same relative water level, added a little moss.

I didn't measure it, probably about 300 ml. I figure that the emmersed part of the plant will get its CO2 from the air and won't require any supplemental in the water.

My jug has lost some water so I topped it off after testing the KH. I don't think I will tinker with the water any more, just top it off and let it grow.

The KH increased to 9 which doesn't surprise me now. The plants are not using the CaCO3 as I thought they might and the reduced water level due to evaporation would increase the concentration. I suspect that there may be other methods of adding usable carbon and I have read about one using methanol to supply it for biofilms (nitrifying organisms) but I'm not sure that it would work for plants.... I'll leave that for someone else to quantify.

It appears that the duckweed didn't do as I thought it might, I anticipated die off as it was so thick but that hasn't happened. Everything seems to have thrown out a lot of roots, even the stems that I had emmersed got roots into the sand.

Jeff.
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Old 04-14-2013, 01:26 PM   #24
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=D ur really tackling the micro tank challenge!
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Old 04-14-2013, 01:55 PM   #25
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Working in that narrow space certainly is ...interesting. Cleaning the sand is no big deal though. I have one other plant that I would like to put in here to balance the larger stem... sort of a dwarf pennywort with a really fine stem.
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Old 04-14-2013, 02:12 PM   #26
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Oh? I feel inclined to make a carper for my ghost shrimp tank. lol
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