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I have been scared numerous times because if "sleeping fish". I have gone so far as to test everything, and stay up for another 30 minutes moniterig the fish lol. But yes, if it is late, sleeping. My fish usually hit the sack around 8-9
What size tank, what fish and how many?
What exactly are the test results (numbers please )?
How long has the tank been set up?
What's your water change schedule?
Temperature of the tank?
What filter are you using?
Did you make any changes recently (clean the tank, add anything or remove anything, etc)?