Co2 question - The Planted Tank Forum
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post #1 of 7 (permalink) Old 05-30-2018, 04:27 PM Thread Starter
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Co2 question

So I run co2 in my tank at about 1bps or a bit less. I have plenty of surface agitation from eheim canister and aquaclear. I always notice that my fish are fine when the lights are on. But when I wake up in the morning when lights are off I see the fish on the surface. My lighting schedule is 6pm-12mn so I can enjoy the tank when Im home.

How come theyre not getting enough oxygen? My tank isnt overstocked by any means. I cant even get nitrate over 20ppm because of all the plants in my tank.

Tank size 40 x 16 x 14
Stocklist
20 lampeye killi
8 rice fish
6 pseudomugil luminatus
10 Pygmy cory
10 nickel sized mystery snails
10 Heterandria formosa


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post #2 of 7 (permalink) Old 05-30-2018, 04:32 PM
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Does the CO2 shut off at night? Any chance it is still being pumped while the plants are not using it during dark hours?
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post #3 of 7 (permalink) Old 05-30-2018, 04:42 PM Thread Starter
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Does the CO2 shut off at night? Any chance it is still being pumped while the plants are not using it during dark hours?


Everything is on a timer. Co2 turns on at 4pm and shuts off at 10pm.


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post #4 of 7 (permalink) Old 05-31-2018, 05:06 AM
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it could not be from your co2. I run 2 bps in a 20 gallon and don't have any fish gasping at the surface. you could try turning off your co2 for a couple days and see if it changes anything. if it is co2 I would recommend having the co2 come on an hour before lights on and off an hour before lights out. temperature also affects co2 retention in water. higher temperature means less co2 and vis versa

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post #5 of 7 (permalink) Old 05-31-2018, 03:43 PM
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Quote:
Originally Posted by nickquinteros View Post
it could not be from your co2. I run 2 bps in a 20 gallon and don't have any fish gasping at the surface. you could try turning off your co2 for a couple days and see if it changes anything. if it is co2 I would recommend having the co2 come on an hour before lights on and off an hour before lights out. temperature also affects co2 retention in water. higher temperature means less co2 and vis versa

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While we may get somewhere close on judging how much CO2 is too much, I would not totally agree with saying it is not a CO2 questions. Reason for this is the the amount of CO2 in a specific tank is not just how much we put in but a result of what goes in and what goes out through gassing off or plant use. Things that change the answer are how efficient the diffusion, how much plant mass and how they grow, as well as how much is lost due to splashing and other factors.
Too early to say it is not a cause until we look at several things.
Other info that may help? How do the fish act when not using CO2? Do you have experience with those fish before using CO2 to know how they react to darkness in your setup? What I'm driving at is the question of this being for sure something unusual for these fish. Fish types do have different reactions to the same setting/situation and I'm not into that specific group well enough to know what is "normal" for them. Some of my fish do go to the top and hide out almost like resting on the tiger lotus leaves while other tend to just settle near the bottom when the light go down.
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post #6 of 7 (permalink) Old 05-31-2018, 04:42 PM
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aren't lampeye killi and rice fish already top dwellers? My topd wellers almost always sleep at the top of the tank.
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post #7 of 7 (permalink) Old 05-31-2018, 04:51 PM
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aren't lampeye killi and rice fish already top dwellers? My topd wellers almost always sleep at the top of the tank.
Thanks for throwing in some real world experience with these. That is where we sometimes get spooked into thinking there is a real problem when it may be---or not. Always good to keep an open mind on finding the causes and not rule out something too soon.
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