during the day your algae and such will produce O2. at night they consume it, my guess would be that you are low on O2 in the mornings due to the photosynthic cycle. Do you have a skimmer?
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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