I have problem with my canister filter at the moment. Does anyone use or ever used Eheim canister 3e? It has buttons to adjust the speed and 7 LED light indicator bars on top of them. Basically you press '+' or '-' to control the speed, with maximum speed is that all green lights plus the top orange light all lit. However, after using it for 2 months, I am no longer able to adjust the speed, no matter any buttons I press, the light indicators stay the same at 4th bar (medium speed) and my water flowrate is very low (almost trickle). I have reset the setting to factory default, I have removed the gunk that stay inside the hose, I have cleaned each of the canister filter trays (there is a white little tube which fell down and I couldn't find where it belongs to). Nothing works so far.