My filter has been loud and clanky tonight and so I took it out to clean it. I took all the media out and just got rid of the debris in my HOB. I was puzzled at a tan, sandy thing in the filter. I washed it out, put the media in, and plugged it back in. Still loud. I lift the intake and see a reservoir of that sand. It looks like it might be going down into the motor or up from it. This tank has gravel, no sand. I'm puzzled, and this loud filter is starting to annoy me. It's working fine despite how loud it is. But it is quite annoying and Im worried it might quit on me. I might just go out and buy a new one. I'm still puzzled on the sand stuff, though, and think it might be a clue as to why the filter is clattering.