I just got a used cansiter filter (Penn-Plax Cascade 1500 Canister) and everything seems to be going well only that every once in awhile my filter spits out air along with the water in the exit vent... is this normal?

Do you mean you get bubbles coming out of the spray bar under the water?

Yes I have bubbles coming out but I am not using a spray bar..

I have the hose going directly into the water with some attachments to help the direct the flow of water.. it has a little flappy thing on it also.. what you would see on a power head

hope this makes sence

thanks

I don't think you have got anything to worry about. When the water comes out of three out that pipe on the filter, it will create oxygen bubbles, this is very important as your fish need oxygen. All my filters create bubbles when the water comes back into the tank