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gnatster said:
The water from the faucet is under pressure and contains a higher concentration of dissolved gasses. What you see is the out gassing of the water. This is the same reason it is recommended to leave tap water out overnight before testing pH.
I de-gas my water (post-RO) and heat it to match the tank temp for 3-5 days and I still get this effect after a water change.

Isaac
 
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