So i just got an Aquaclear 30 filter and i set it up according to the instructions and when i put it in and turned it on, at first it was ok then it started to make this grinding sound then it would stop and start a few minutes later. I just re-set up my tank with seachem flourite red substrate. could that be the problem? the dust and muck getting into it? i took it out multiple times and took it apart and put it back together but its still doing it. please help?