How long did you let it run? I've heard it can take some time for all the air to purge from a canister filter. You may just need to let it run a few days. Some people say that rocking their canister back and forth gently can help get some of the air out.CichlidAndrew said:Every time i turn on my canisters little air bubbles come out of the spray bar. I took the top off of them to try and get the air out but the little bubbles keep coming. It is very frustrating. What should I do?