Plants deteriorating upon CO2 injection - The Planted Tank Forum
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post #1 of 7 (permalink) Old 07-25-2020, 06:20 PM Thread Starter
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I started injecting CO2 in my 60 gallon planted tank and ever since I’ve noticed my rotala indica plants have started to turn a little brown and new growth has stopped. Does this mean I need to increase the nutrients? Up to this point, I’ve been adding two or three cap fulls of Seachem Flourish Advance. The vals have been in there for at least a year have been spreading fine, but growth has also seemed to slow with them. The rotala indica was showing lots of new growth when I put them in two weeks ago and now growth is at a halt since injecting CO2.

Maybe the rotala indica is going through it’s melting phase and it’s just a coincidence that I just started CO2?
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post #2 of 7 (permalink) Old 07-25-2020, 09:06 PM
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well, according to seachem, "During the first ten to fourteen days after application, Flourish Advance™ works to stimulate root growth beneath the surface. After this initial induction period, significantly enhanced growth in the leaves and stems of the plants will occur."

perhaps that's what's happening. but i think your ferts are lacking. flourish advance does not contain no3 and traces including iron.

you have provided only 2 of the 3 things that are vital to planted tanks. google aquarium plant fertilizer, pick a dealer, order kno3, kh2po4, k2so4, and csm-b. one pound of each will last you at least 1 year, set you back ~$35. use rotala butterfly nutrient calculator to figure how much of each to add to your mixing bottle. for a working example on how to mix your own, check out dennis wong's site, the best planted tank resource on the internet.
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post #3 of 7 (permalink) Old 07-26-2020, 02:22 AM Thread Starter
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well, according to seachem, "During the first ten to fourteen days after application, Flourish Advance™️ works to stimulate root growth beneath the surface. After this initial induction period, significantly enhanced growth in the leaves and stems of the plants will occur."

perhaps that's what's happening. but i think your ferts are lacking. flourish advance does not contain no3 and traces including iron.

you have provided only 2 of the 3 things that are vital to planted tanks. google aquarium plant fertilizer, pick a dealer, order kno3, kh2po4, k2so4, and csm-b. one pound of each will last you at least 1 year, set you back ~$35. use rotala butterfly nutrient calculator to figure how much of each to add to your mixing bottle. for a working example on how to mix your own, check out dennis wong's site, the best planted tank resource on the internet.
I have all the ferts (I do EI dosing on my other tank). I was just curious why CO2 would cause the plants to struggle when all else is the same.

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post #4 of 7 (permalink) Old 07-26-2020, 10:55 AM
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It looks like the lower portions of the stems are shaded partially by the wood but mainly by each other due to the bunched planting. With co2 and proper dosing and lighting, it should grow very quickly and require regular pruning.

I would trim off the older browned sections of stems, and then replant the healthy upper portion of stems about an inch or so apart to ensure they aren't crowding each other and preventing light reaching the full stem.
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post #5 of 7 (permalink) Old 07-26-2020, 11:30 AM
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I have all the ferts (I do EI dosing on my other tank). I was just curious why CO2 would cause the plants to struggle when all else is the same.
basically, you were starving your plants. yeah, you give them light and co2 but you need to feed them too. seachem product was not sufficient to meet those needs. planted tank trinity:light, co2, ferts.

agree with steve about cutting and planting the tops.
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post #6 of 7 (permalink) Old 07-26-2020, 06:50 PM Thread Starter
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I just checked my nitrate and it was only 5 to 10 ppm. That would explain it. It was over 40 when I checked it the other week, but that was because my canister had accumulated a bunch of plant matter. Now that the canister is clean and I did a good gravel vac, the nitrate level has dropped substantially. I'll probably do an EI light dosing regime on this tank because I don't care to have two EI tanks at the moment, and sure as heck don't want to be doing 50% water changes on a 65 gallon tank every week.

I left them bunched because I have six geophagus that keep digging them up, which is why I have rocks surrounding them. I'm currently trying to rehome them. Anyone in the northern VA/DC/MD region?

If I decided to start EI dosing this tank, would it make sense to cut the nutrient levels in half until I start seeing more significant growth? Otherwise my levels will get too high if there is little plant uptake, correct?

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Last edited by Darkblade48; 07-29-2020 at 09:01 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #7 of 7 (permalink) Old 07-27-2020, 02:14 AM
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Half might be good, probably just need more of everything than you were doing before, but not necessarily ei levels of more. CO2 instantly increased the need for nutrients


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