Bba caused by low co2? - The Planted Tank Forum
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post #1 of 22 (permalink) Old 06-27-2019, 11:09 AM Thread Starter
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Bba caused by low co2?

Hi. So I've noticed that my plants have substantially slowed in growth. Some are turning brown and yellow. I've also noticed some bba growing on my wood and plants. I thought maybe it's because of low co2 caused by high plant density and 9 hours of light a day. To fix this problem, should I lower the light hours. Any advice would be greatly appreciated.

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post #2 of 22 (permalink) Old 06-27-2019, 12:27 PM
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Lower light
Increase cleanliness of tank and filter
Ensure CO2 is abundantly high

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post #3 of 22 (permalink) Old 06-27-2019, 07:39 PM Thread Starter
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Originally Posted by Quagulator View Post
Lower light
Increase cleanliness of tank and filter
Ensure CO2 is abundantly high
Thanks for the advice. I lowered my light hours from 9 to 7 hours a day. Is there a specific way I can increase the amount of CO2 in my tank without injection?

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post #4 of 22 (permalink) Old 06-27-2019, 07:42 PM
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Thanks for the advice. I lowered my light hours from 9 to 7 hours a day. Is there a specific way I can increase the amount of CO2 in my tank without injection?
No...

You can try dosing Excel / Metricide / Glut... Not CO2 but it is an algaecide

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post #5 of 22 (permalink) Old 06-28-2019, 06:18 AM Thread Starter
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No...

You can try dosing Excel / Metricide / Glut... Not CO2 but it is an algaecide
I have tried excel, but it hasn't been very effective. I'll just stick with the 7 hours of light a day and maybe my plants will start to bounce back.

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post #6 of 22 (permalink) Old 07-05-2019, 07:46 AM
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What kind of plants do you have? And are you running co2 at all?
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post #7 of 22 (permalink) Old 07-05-2019, 09:05 PM Thread Starter
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What kind of plants do you have? And are you running co2 at all?
I have water wisteria, java fern, jungle val, amazon swords, crypt lucens. No CO2

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post #8 of 22 (permalink) Old 07-05-2019, 09:17 PM
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Good major cleaning...removal of any excess organic waste can help. Decaying driftwood can exacerbate it too, not sure if that's an issue. I recall having a horrible issue with this a number of years ago, ended up throwing out my driftwood.
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post #9 of 22 (permalink) Old 07-05-2019, 09:24 PM
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Decaying driftwood can exacerbate it too, not sure if that's an issue. I recall having a horrible issue with this a number of years ago, ended up throwing out my driftwood.
Interesting--- Ive never heard of the connection with between BBA/ driftwood before.

If that is the case, that could be why I have such problem with BBA in my discus tank. The tank is spotlessly clean- 2 x 75% water changes weekly and vacuumed with python, filters regularly maintenanced- high organics is not the problem.

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post #10 of 22 (permalink) Old 07-05-2019, 09:44 PM
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Originally Posted by Hi-Chiu View Post
I have water wisteria, java fern, jungle val, amazon swords, crypt lucens. No CO2
Avoid Excel in tanks with val. If the plant demand is that high, even an airstone might raise CO2 level a little. Nowhere in the neighborhood of pressurized though. Passive is an option I've done for a long time, but it's something you have to do every day and hard to get over about 15-20 PPM.

Nothing good happens fast in an ecosystem.

Last edited by Blue Ridge Reef; 07-05-2019 at 09:54 PM. Reason: a word
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post #11 of 22 (permalink) Old 07-06-2019, 07:45 AM Thread Starter
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Avoid Excel in tanks with val. If the plant demand is that high, even an airstone might raise CO2 level a little. Nowhere in the neighborhood of pressurized though. Passive is an option I've done for a long time, but it's something you have to do every day and hard to get over about 15-20 PPM.
I can try the airstone, but the flow seems to be a bit too much for my tank, do you recommend me use it still?

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Originally Posted by Blue Ridge Reef View Post
Avoid Excel in tanks with val. If the plant demand is that high, even an airstone might raise CO2 level a little. Nowhere in the neighborhood of pressurized though. Passive is an option I've done for a long time, but it's something you have to do every day and hard to get over about 15-20 PPM.
So today, I noticed most of the bba has died off. I took it out a week ago and sprayed it with excel and it seems to have done the trick. However, a brown hair algae has started to grow on my plants, and may be choking them out. Im not really sure where this came from.

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post #12 of 22 (permalink) Old 07-06-2019, 02:59 PM
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An airstone is only going to make a tiny bit of difference, but if your CO2 is at 0, would be of a theoretical benefit. Kind of like how plants will pearl after a water change from being exposed to air -there is CO2 in atmospheric air, just not a lot of it. A weaker air pump or a gang valve to bleed excess pressure off would slow the flow rate if you needed. But again, this isn't likely to make a noticeable difference.

Yeah, often happens that when you eradicate one algae, another comes along. If nutrients are there nature will find a way.

Nothing good happens fast in an ecosystem.
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post #13 of 22 (permalink) Old 07-06-2019, 09:13 PM
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I wonder if maybe the light intensity is more than the plants can use considering the low co2. From my understanding light drives growth and with low co2 the plants are limited in growth that way, so the excess light will drive something else to grow in their place.


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post #14 of 22 (permalink) Old 07-06-2019, 09:26 PM
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That is correct. Though if nutrients are abundant enough, *something* will utilize them even in lower lights.

Nothing good happens fast in an ecosystem.

Last edited by Blue Ridge Reef; 07-07-2019 at 12:43 AM. Reason: getting rid of the stupid bump
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post #15 of 22 (permalink) Old 07-06-2019, 11:05 PM
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Originally Posted by Blue Ridge Reef View Post
Avoid Excel in tanks with val.
I've heard the same thing about Excel & val, but have also read many posts on here from people who dose it regularly & say their val has acclimated well to it. I've been using it (API "Liquid CO2"--assuming it's the same thing) regularly to combat a green water outbreak after set up. My vals have really taken off to about 3/4 the height of my 24"H tank, and are putting out runners. So I wouldn't dump a lot in at once, but vals can acclimate and do well with glut.

I guess the real question is whether BBA would end up acclimating as well.....
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