Plans to set up 29g tank

Basically a lot of tiny bubbles are created inside a reaction chamber. Wastes are attracted to and stick to the oustide of the bubbles where water meets air. A cone at the top of the chamber that tapers upwards condenses the foam. At the top of the cone, the bubbles pop releasing the waste where it drains into a collection cup. It takes the place of waves in the ocean.
 
So the cup has to be emptied periodically?
 
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