| | Re: Rhinox 2000/5000 diffuseur
I use a Rhinox 2000 in my 33 gal. It's excellent but you do need to buy the suction caps separate. The 5000 comes supplied.
Keep it clean using bleach every week or so to ensure the bubbles stay tiny. It's surprising the difference after such a short time.
Another tip is to position it to ensure the water flow picks up the bubbles and fires them all over the tank.