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Discussion Starter · #1 ·
Lets say you have a plant tank, no fish or inverts. Could you REALLY crank up the co2? Like over 100 ppm of it. Would you have to up your lighting or could it stay the same? say 3.25 watts per gallon. Would you need to add more ferts?

Just for the hell of it, and to see what happens, i'm doing it now. My plants are pearling like CRAZY! I'm using the mist method into a HOT magnum and my tank looks like a Champagne glass. Microbubbles EVERYWHERE. I moved the shrimp to a shrimp-only lowtech cycled tank before I did this.

I saw a little 1 cm long strand of HC floating, and it was pearling, too :) The only thing not pearling is all my Aldrovanda.

Right now, PH is 6.0 (That's as low as my tests go...) and KH is 80 ppm.
 

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You potentially can get the CO2 up to about 1500 ppm before the water is saturated. I doubt that you want to try that. The plants will grow only as fast as the limiting factor allows, and with a huge amount of CO2 and adequate fertilizers, the limit will be the light intensity. So, super high CO2 is just wasted.
 

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Discussion Starter · #3 ·
Hmm... How high can I go given the light I do have, without getting more light that is.

I don't plan on putting in any more than I already am. I just thought this would be a neat experiment :)
 

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if you have hitchhiker snails you will get a mean ammonia spike!!!

i dont have fish in my planted tank but snails come and go...just checked my co2 last night cause i found some fish i might want to add and i am at 70ppm's of co2. the high co2 will eventually kill the snails that you dont see and they willl rot.
 

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Discussion Starter · #5 ·
Oh I planned on checking ammonia for awhile.

If I ever decide to go back to fish I can just turn it down easy-peasy.
 

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Discussion Starter · #6 ·
I did a trim, I needed to anyway, and on one of the cut Ludwigia stems there is a constant stream of microbubbles coming out, like 3 per second. Really neat lol.

Maybe they do that when they are cut anyway?
 

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If you are blowing micro bubbles all over the tank you can't be sure your plants are pearling. It could well be the bubbles clinging to the plants.
 

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Discussion Starter · #8 ·
Auctually, it's weird because I havn't seen any bubbles stick. I'm kind of sad about that :(

I assume they are pearling... There is a big bubble under the HC leaves on at the center of each shoot. There are no bubbles on the tops of leaves or stems or anything. I could be wrong.

Still looks cool, all those bubbles!
 

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Bubbles won't stick on the top. They will float away. True pearling will be bubbles on all surfaces. Bubbles collecting under the leaves is just trapped CO2.
 

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the stream of bubbles that look like a strand of hair happen whenever there is injury to the plant i.e. pruning, cutting....etc
 

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I don't often disagree with Rex, but I do this time. Bubbles from either pearling or stick-on CO2 won't remain on the tops of leaves very long. Bubbles float. But, bubbles from any source can easily be trapped under a leaf. So, pearling does generate big coalesced bubbles under leaves. CO2 bubbles, on the other hand shouldn't do that because CO2 dissolves easily and rapidly in water. A big CO2 bubble should shrink quickly, becoming a little bubble.
 

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But not if you have a very large amount of CO2 bubbles in the water column. You will be constantly replenishing the larger bubbles.
 

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Speaking of high levels of C02, I have had my 20 gallon fishless for about a month besides 2 ottos, and tonight i decided to add 10 neons and two blue rams. Well, I found out the hard way that my C02 levels were too high and most of the neons aren't looking so well. Thankfully I had a spare air pump to out gas any unwanted C02.
 

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A cheap little "drop checker" will let you know for sure what your CO2 level is in the water, and you won't have to try to guess by fish behavior what it is. I suspect that if the rams were not upset by the CO2 it probably wasn't high CO2 that was bothering the neons. Neons can be pretty delicate when first added to a tank, or that has been my experience anyway.
 

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With some testing I found my ph 6.0 and my kH around 15 degrees . . . . which according to this online C02 calculator means i have somewhere around 570 ppm C02 level. I did a 50% water change with 100% RO water and checked the kH again and it read 5. The neons and the rams are looking great now. :icon_neut
 

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Discussion Starter · #18 ·
My well water's KH is very low, and I decided since i don't have fish and don't have to worry about a PH crash, i'd stop adding baking soda. Now my KH is about 2.

Is this a problem? Are plants affected by too-low PH? Can plants experience a PH crash?
 
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