The Planted Tank Forum - View Single Post - CO2 Tank Ran Out... What if any changes till a refill?
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post #6 of (permalink) Old 03-27-2015, 03:35 AM
Planted Tank Guru
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The consequence of having no CO2 for a couple of days is a BBA attack. Anyone who has ever had such an attack should agree that it is well worth being over cautious so as to avoid that. I would just leave the lights off until the CO2 is restored. Plants easily tolerate a couple of days without any light.

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