I have a 2007 Key Largo 210 Bay Boat CC with 2 livewells fore & aft, the problem is I can't get water into either well. Have opened up fill tubes when in the water, turned aerator pump, could hear it running, but no water. No extra water in the bilge, filled up both tanks with water, turned on pump, could hear pump running, but no action in either tank. Pushed water back thru fill tubes & water came out of pick up on bottom of boat. Have drained tanks, fore tank drains on left side on lower transom & aft tank drains on rightside lower transom. Could I have blockage in pick up line & how do I clean out pick up line/supply, hesitant to use electrical/plumbing fish.What's next?