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[Jason McKenzie]

There are a lot of ways to get ride of the tiny bubbles.
1) put a few Baffles in your sump to force the water to the bottom and then back to the top before is gets to the return. Might be tight in a 20G sump but worth a shot.
2) add a filter sock to the drain. These need to be changed every other day and washed so there is added work
3) add a prefilter to your return pump. again these need to be kept clean
4) try and direct the overflow drain away from the return. This can be done with a simple 45 angle piece of PVC

As for the Bed filter I would continue working on it. It will help with what you want to do

BTW Welcome to 3Reef glad you found us.

Jason