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Old 12-19-2003, 04:56 PM   #11
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OH NO!!!!!!!!

Selzer water is a saturated solution of CO2 in water. According to my trusty Merk Index, the solubility of CO2 is 880 ml in 1 L water at 20o C. With a density of 1.976 mg/ml at atmospheric pressure, that works out to 1739 mg/L, or 1739 ppm.

Assuming that 0.5 L of selzer water got into your 75 L tank, the concentration of CO2 would have skyrocketed to 11.6 ppm (0.5L/75 L x 1739 ppm)!!!
I've read that anything above 2 ppm CO2 is lethal.

Any chemists out there, please check my calculations for accuracy.

Then, as Enki pointed out, the excess CO2 in your tank formed carbonic acid (H2CO3(aq)) resulting in a drop in pH.

Your poor fish! Did any survive? Keep us posted.
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Old 12-19-2003, 05:04 PM   #12
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I just read your subsequent posts. Thank goodness it's a heavily planted tank. Between your massive water change, increased aeration, and the presence of the plants, your fish may pull through this.

I would suggest keeping your lights on for a few hours to encourage photosynthesis.

The plants (but not the fish) will thank you for this mishap!
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Old 12-19-2003, 05:39 PM   #13
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Good point QT but he'd need a botanical garden to photosynthesize that much CO2.
I didn't want to bring up the ph drop because those fish are so stressed that another violent swing in the other direction would almost certainly kill them.
That's why I wouldn't do to much water changing right away.

The best hope is to get as much O2 in that tank as quickly possible and gas out the CO2. The ph should rise gradually and those fish he has left will hopefully survive.
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Old 12-19-2003, 09:53 PM   #14
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Final casualty tally: 10 neon tetras DOA, 1 otto and one clown loach MIA (can't see them or their bodies anywhere, so might still be alive).

Bloody pain in the butt this was.
(Bottle doesnt say anything about caffeine in it. Not to say there isn't any. Ive heard that its not something that has to be listed. Oh well.)
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Old 12-19-2003, 09:57 PM   #15
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oh, and QT, it was unfortunately closer to a full litre. (The bottle was 2L) ****... poor little buggers.
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