my fx6 all of a sudden started making a loud buzzing noise, sounds like its coming from the pump, ive had my filter for about 2 months now and it was fine until about an hour ago, i want to take off the pump and possible clean out the impeller. will i have to drain the water from the filter to remove the pump? this is my first time ever even using this filter, just looking for some input as to what i should do. has anyone else experienced this problem? please help