When I first installed it I only got bubbles on one end of the wand, but then I remembered I hooked it up to a pump designed for a 10 - Gallon aquarium was designed! After I replaced the pump with my 10-30 gallon pump it worked great. I have blisters all over the bar. Now the fish are much more active. I think if you are using a smaller volume pump it will work better with a shorter stem. live and learn
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