micro bubbles from chiller

Hi MagMan - the only 3 possibly reasons why your chiller would "give off" microbubbles into the display tank, are:
1) your supply pump you are using for your chiller, is sucking air somehow/somewhere
2) you have an "airleak" (however tiny) in the fittings of the chiller/plumbing
3) your outlet pipe is not deep enough into your display tank, and the amount of water coming out of the outlet pipe, is such a strong current, that it is "drawing in" air, by creating a tiny vortex around the outlet pipe.....
 
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