I got home today from work and one of my 6025 nanos was making a weird vibrating sound. I removed the pump cleaned and the it still make the noise. I tried looking here on reefcentral for similar problems. I decided on removing my other 6025's also to give them all a cleaning. The two good one's had the shaft that stayed in placed and the one that was vibrating had a loose shaftthat came out. When I removed the prop the shaft came out with the prop and on the other two it stayed in place. Is this normal? Is the shaft suppose to come out? Please help me, I plugged the pump back in and the noise is still there. Thanks Mikee68