Skimmer Shooting micro bubbles!! HELP

[eisa]

Hey Guyz,
I have 90 gallon tank, set up a month back. I have a skimmer which was working perfect for a month & my friend had it for more then 6 months without problems, couple of days back it started shooting micro bubbles and it fills my tank & it is so annoying... I tried every possible thing, i don't know what differently can be done to fix it. I don't know the name of this skimmer. However, if any of you have been thru this problem plzzz let me know. very similar to the link i posted below.

Eagerly waiting for any piece of advice guyz... Thank you so much for reading..

http://www.jlaquatics.com/product/ps...25+Gallon.html