03-17-2013, 02:50 PM
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if i follow and undersatnd correctly here, your saying the plants are using the kh as thier source of carbon rather then co2? never relized or thought about that. have you noticed slower growth of this method vs injection? lower maitence is always welcomed and sounds easyier then timeing bubbles and setting up a co2 system and exchangeing ur tanks gasping fish etc etc and the ph flux.
03-21-2013, 08:50 AM
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Here's a shot of the Bacopa breaking the surface of the duckweed patch in the jug experiment and a shot of the original clump of these stems. I took one, cut it so that it was just tall enough to be at the surface of the jug two days ago, and it is doing well.
I wonder if I can get this to flower this way... if so I will have an excuse to keep the jug as it will look a little more aesthetically pleasing to my wife.
I added some more sand to allow better rooting of stems as they get taller.
KH is run down to between 6 and 7... say 6.5. I thought the bottom might have been 4, and it may be, but I had to add some water due to my testing.
I did a pH test a few days ago. It's been riding 8.4 so I took a glass of water out after sundown (min CO2 concentration) and let it stand for a few hours while intermittently bubbling it to see if I could inject some CO2 into a depleted water. The second test did show a slight drop in pH, not enough to say 0.2 but enough to see a definite difference in the purple colour towards 8.2. I have to assume that is from a slight increase in CO2 concentration. This using only air. How much was from me bubbling and how much was from just surface contact, I don't know. With the duckweed mat in the jug, surface transfer would be minimal anyway.
I forgot to test the pH in the morning to see where it sits after the plants do their respiration bit and to compare it to my little bubbling test.
I may buy a small air pump and stone and bubble the jug to see where the pH ends up.
Anyone have any suggestions for a really quiet really small air pump and a fine fine stone?
I know this doesn't get the KH addition test anywhere as adding CO2 into this environment using just air would only work in a severely depleted tank. But I am curious and I have some work to do before testing anything else anyway.
I could start with fresh water, bubble in the air and compare the KH reduction from the get go.... another time, but I might expect the KH to be depleted slower, not at all or have a higher "bottom end" if the air can diffuse CO2 into the tank at a similar rate as the plants will use it.
I am looking toward setting up a plant only tank with the bare minimum of external support (filters, pumps lighting) so everything that I do here is pertinent. I've got this west facing wide window ledge in my office that would be cool to have a tank in and not have to worry about fish.
03-21-2013, 10:52 AM
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drop a few snails in the plant only tanks, they are my favorite clean up crew.
For the air stone I actually would recommend a CO2 glass diffuser if you want it to be very fine. It works very well ^_^ and ebay is your friend on this one.
Airpump... I use tetra whisper airpump. but in general when compared to my azoo HOB and internal filter, airpumps are noisy noisy things.
very cute emergent bacopa XD if it doesnt flower come the warmer weather put a red lght over it ^_^
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