Levels of CO2 - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 09-14-2005, 10:17 PM Thread Starter
Algae Grower
 
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Levels of CO2

Quick question - What's the max level of CO2 which most fish can survive?

At the moment I have 3 Otos, 2 Peppered corys, 2 neons and a guppy. KH is 12 while pH is 7.0. I'm using the fermentation reaction with the hagen ladder.
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post #2 of 5 (permalink) Old 09-14-2005, 11:01 PM
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If there's enough O2 in the water then quite a lot. I've had CO2 levels up in the 80+ppm range with no ill effects to the fish.

óBill
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post #3 of 5 (permalink) Old 09-15-2005, 12:03 AM Thread Starter
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I've been a bit weary over CO2 since I managed to kill most of my fish last week with DIY CO2 where it went up to ~150ppm.
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post #4 of 5 (permalink) Old 09-15-2005, 12:07 AM
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DIY can get you sometimes. I had the same thing happen to me in a 29g tank where the CO2 went from about 20ppm to 140ppm overnight. It's a bit safer with pressurized since you have full control of the injection rate.

óBill
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post #5 of 5 (permalink) Old 09-15-2005, 01:59 AM
BSS
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I've been running at 50+ ppm for several months now, with no noticeable effects. I'd guess what really hit you was the rate of change (e.g. if the CO2 levels jumped that high over a 1-2 day period) versus the actual ending levels. My opinion, anyways!

46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member
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