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Old 07-16-2012, 04:30 PM   #25
oblongshrimp
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Its an O2 deficiency that has the sitting at the surface. I had a tank in which they would do that each morning until the light came on and the plants starting making O2. The tank did not have CO2 on it but it didn't have enough surface agitation at night to keep the O2 levels adequate.
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