lots of tiny bubbles

[scrmom]

When I turn the protein skimmer on there are lots of bubbles shooting into the tank. When I turn the protein skimmer off, the bubbles clear up. What do you think is the problem?

[Marc118]

Is this a new skimmer? There is usually a "break in" period for HOB skimmers IME.

[scrmom]

It's not a new skimmer. I have had it since aug 06. It sits inside the sump. I have never used the bubble diffuser before, so I put the hose inside the diffuser and that has removed most of the bubbles. From reading other posts, I may have a leak somewhere?

[Ziggy953]

What kind of skimmer is it?