Canister filter coughing microbubbles

[Meredith]

My cascade 1000 has started spitting out gobs of these teeny, tiny air bubbles. Its not constant but it happens once or twice a minute. Any ideas as to why its doing this?

 

[bigsky]

I have a magnum 350 canister that does the samething once in a while.
Believe it or not you have an air leak at one of your connections, even though you don't see a leak when you turn it off. On my canister it is usually the the hose that comes from the tank and the leak is one the the two o-rings in the quick disconnect. Hope that helps.

 

[Meredith]

thanks. I will check all the connections. :?