I tried the BioCube one for the past 3-4 months...unfortunately it just wasn't working. I would basically just get clear water collecting in the cup regardless of how I adjusted the air valve.
Quote:
u can adjust the o-ring around the cup up and down and adjust the air valve open and more closed the cup
As far as I can tell, there isn't an o-ring. The cup and the base it sits on aren't adjustable in any way. I've been experimenting with the air valve, turning it one way and then the other. The maximum amount of bubbles seems to be coming with where the air valve is now positioned. The bubbles are still only at the base of the little cup. Perhaps it will just take time??