Update....on this piece of crap.
I never did get it to work. I tried numerous ideas......the unit returns millions of micro bubbles to the tank and produces no foam into the cup. I must have monkeyed with this thing steadily for 3 weeks before giving up. Save your money.....do water changes and keep you eyes peeled for anything out of the ordinary in your tank.......
If anyone wants to buy it.....they are welcome to it.