The Planted Tank Forum - View Single Post - First day of CO2 and 5 tetras died :(
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Old 02-12-2013, 02:31 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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