I have a 6200 that's been operating for about 6 weeks. I don't have a controller yet so it's running 24/7. Sometimes I'll notice the current doesn't seem to be as strong as it can be at other times. If I unplug it and wait a couple hours, when I turn it back on, it seems to be moving much more water than before. Does it need to be shut off occasionally? I was thinking of getting a normal timer and setting it for 3 hours on 2 hours off, until I can get another 6200 and a controller. Is this a good or bad idea?