Help. I have had this skimmer for a couple months and it has been very efficient. But within the last day or two I noticed the feeder pump is not sucking in water as powerfully or efficiently as before. Before, when I would feed the fish from the other end of the tank, the fish food would start flowing toward the feed pump. Now I barely see a current heading toward the pump. I removed the feeder pump, took it apart, rinsed it out. It didn't appear to be clogged. I put it back together, and still not any better. Is the pump just dying?