So I set up my first planted tank recently and everything's going to plan with the exception of a little problem I'm having with my Fluval G6. The filter almost constantly spits out air bubbles from the spray bar outlet and every few minutes there is a large evacuation of bubbles all at once. I've tried shaking the filter, tilting the filter, toggling the filters power on and off, emptying and re-priming the filter and pressing the priming button down until I could do it no more and still I have many tiny air bubbles from the outlet. Where are all these bubbles coming from? How do I stop it? Thanks guys.