Well kiddies... After a long night pondering why my Fluval is leaking.. I haven't figured out the reason.. The 'O' ring is nice and secure and I even took it out for the night, but it still leaks around the edges. There are no biubbles comming out of the outtake of the hose, and no loud sounds. It just leaks when I prime it manual with water.. Here's a picture below.
