DIY projects

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We have had cloudy water in the display tank, and thought we were dealing with fines in the water. We added an extension to route the water flow from the return over the long axis of the tank, and noted there were micro bubbles coming out of the return. We checked the skimmer, and the water coming from it had no noticeable bubbles. We did have lots of bubbles coming from the drain pipes into the sump.
Since our sump is a 100 gallon tub, we had to fabricate some sort of bubble trap from what ...