First day of CO2 and 5 tetras died :(
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Old 02-12-2013, 03:25 AM   #1
greenaqua
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First day of CO2 and 5 tetras died :(


Today was the first day of CO2. Its a 30G new tank (3 weeks old). Ammonia 0.25, Nitrites 0, Nitrates 5. I use 2X21W light. I had 8 Rummynose and 8 Neons and 2 cherry shrimp.

I set the CO2 at only 1 bubble per 2.5 sec. I set the light and CO2 to start at 1PM and when I got home in the evening at 6PM, 5 tetras have died but the rest were running around as if nothing had happened and not gasping for oxygen or anything.

Any reason why it may have died? too much CO2?
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Old 02-12-2013, 03:27 AM   #2
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Default First day of CO2 and 5 tetras died :(

Ammonia = not cycled


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Old 02-12-2013, 03:31 AM   #3
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If the CO2 was still pumping when you got home, and none of the rest of the fish were "gasping" at the surface, then CO2 wasn't the culprit.

More likely is that your tank isn't cycled yet (that you have any ammonia readings all but proves this), and possibly (though you didn't mention how new the fish were) the disease that they might have carried with them from the LFS killed off a handful all at once ...though 5 within 5 hours is a bit odd, unless you added them to the tank within the past couple days.

Anyway, look beyond CO2 for the reason.
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Old 02-12-2013, 03:46 AM   #4
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I agree with kevmo911; the cause is not due to excessive CO2, but is more likely the ammonia levels that are present.
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Old 02-12-2013, 03:50 AM   #5
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It usually takes 1-2 months for a tank to cycle FYI
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Old 02-12-2013, 05:25 AM   #6
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Quote:
Originally Posted by UDGags View Post
It usually takes 1-2 months for a tank to cycle FYI
Cycling can be much faster than that, or, in some cases, might be that long. If you have a heavily planted tank from the start, and use some mulm in the filter or substrate, cycling can go very fast. Plants that have been growing submersed will have lots of beneficial bacteria growing on them, so, with enough plants you have sufficient bacteria to cope with a few fish in the tank. Of course adding a lot of fish at one time, or big pooping fish, can cause problems from insufficient bacteria being available. And, growing plants consume a lot of ammonia just by growing, so that reduces the immediate need for ammonia eating bacteria.
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Old 02-12-2013, 05:48 AM   #7
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My assumption would be that with a 3 week old tank (and no reference to when the fish were added) that the fish were having issues before you added the CO2.
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Old 02-13-2013, 01:35 AM   #8
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I started adding fish since ammonia was only 0.25 but didn't realize that could be harmful. Few of the fish stock was 10 days old and other 3days.

I didn't stop CO2 today and the rest are still doing fine.
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Old 02-13-2013, 01:58 AM   #9
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My opinion here only but .25 ammonia is lethal for lots of fish.
This is what i would do....
1) Stop feeding immediately.
2.) check and or clean aquarium for any decaying matter.
3) Carry out a partial water change.
4) Retest for ammonia to confirm near-zero reading(s).
5) Allow the aquarium two days further “rest” without feeding, etc.
6) Retest and repeat steps 1-5, if necessary.
7) If readings are near zero, then start feeding sparingly.
8) Continue to test water to confirm that filter is now coping with ammonia and nitrite production
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Old 02-13-2013, 04:08 AM   #10
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Quote:
Originally Posted by UDGags View Post
It usually takes 1-2 months for a tank to cycle FYI
In agreement with Hoppy, I've cycled in much less than that.

0.25 ammonia is not good for fish, causes difficulty breathing. That coupled with excess CO2 makes for a bad combination.
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Old 02-13-2013, 04:08 AM   #11
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Quote:
Originally Posted by Hoppy View Post
Cycling can be much faster than that, or, in some cases, might be that long. If you have a heavily planted tank from the start, and use some mulm in the filter or substrate, cycling can go very fast. Plants that have been growing submersed will have lots of beneficial bacteria growing on them, so, with enough plants you have sufficient bacteria to cope with a few fish in the tank. Of course adding a lot of fish at one time, or big pooping fish, can cause problems from insufficient bacteria being available. And, growing plants consume a lot of ammonia just by growing, so that reduces the immediate need for ammonia eating bacteria.
All good points and I agree. I said usually 1-2 months but there are many factors the OP didn't tell us so I was more making a blanket statement.
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