Hey guys I just got a fluval 406 and once I got to the part for closing it up with the o ring in place it won’t close all the way. When I take it out I can close it and click both sides. But when the o ring in installed then it’ll close but won’t click to lock. It’s still pretty tight but don’t want to risk it popping off in the middle of the night. Anybody experienced this or have a solution?