My drain runs into a filter sock and is absolutely bubble free. Then comes the skimmer compartment. Baffles keep my display virtually bubble free. I think they do entirely actually as I'm still getting bubbles releasing from the remains of the diatoms on the sand and rocks which get powerhead pureed.
Say yes to baffles! My middle baffle is the one that is raised a bit off the sump floor but I think everyone does it that way.
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