Whenever I do a water change (50% every sunday) I turn off the filter and heater and clean them. I swish the filter media around in the tank water, clean the algae and other debris off the inside of the filter, and clean the pipe that sucks the water into the filter. Now, everytime I do this and I plug it back in after the water change is finished, the filter erupts out a seemingly ridiculous amount of debris back into the tank. It eventually clears up after 10 minutes or so, but should there but that much dirt left to be thrown back into the tank?