My Protein Skimmer isn't bubbling enough ???

[Travelmadness]

My skimmer isn't bubbling much at all. I've got a 70 gallon tank with a pretty standard protein skimmer set-up, but the bubbles are barely coming off the surface of the water.

How can I improve skimming?

Thanks!

 

[reefrunner69]

What brand of skimmer is it?

 

[mrrrkva]

If you let us know it will help, if it has an airstone, change that first. They clog quickly

 

[Biggen]

How long has it been running for?