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The pH drop may have been the issue, but after 3 days I'm not sure. I would think the first or second night would've toasted them if it was the CO2. Anything else changing in the tank, ferts etc? A change of 6.8 to 6.1 is not really that much.

A lot of folks with low tech DIY CO2 setups do run air stones when lights are off though. I don't but I don't drive CO2 on DIY setups too much.
 
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