Quote:
Originally Posted by rsisvixen
While true fish might use less oxygen at night, a tank also has less dissolved oxygen at night with the lowest levels of dissolved oxygen just before lights on. All photosynthesis is halted without light, and algae and zooxanthellae will use up dissolved oxygen and release carbon dioxide at night.
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Exactly. This reverse-photosynthetic process exacerbated the low dissolved Oxygen issue and would have made things worse, NOT better.