The M 150 is about 4 months old.
It works fine except for the clicking sounds, if I moved it the clicking sound stops for a while but then start again.
Today I have turned the 206 off & took the top off and checked the impeller, pulled it out and made sure nothing was around it & re primed until the primer was hard to move.
I turned it on and a lot of bubbles came out, you can still here the impeller turning but not as loud.. I guess I've just got a noisy one and its going to take time to settle in & as long its keeping the water clear I am happy.
The fish seem happy.