I recently acquired a Euroreef RS135 that needed a new cover plate for the Sedra 5000. I got one in and everything seemed fine for about 2 weeks. Now the thing makes this huge grinding noise. When I opened it I found that the pin/needle wheel had come loose from the impeller. I plan to glue it back on tonight but figured I'd ask for comments here. The original impeller has been ground into a hex stock and the pinwheel is matched to it. There is a little slop but not a lot.