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Consider oxygen deprivation. I had a 1500G extended system in which power was lost for a few hours during the night while I was away from home. My UPS system failed during utility power outage. Sandbeds & live rocks house large populations of bacteria that consume oxygen 24/7. All photosynthetic life forms including coral consume oxygen and give off co2, when lights are off.
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Laissez les bons temps rouler,
Patrick Castille
Current Tank Info: 10,000G. Greenhouse Macro Growout
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