The thumping usually stops after a bit but twice now I was forced to plug it back in as it wouldn't stop. That's why I asked about trying to work on it. I finally got it shut down at 5 am before work. It's been off all day as my 3 little clowns looked exhausted this morning from fighting that current and also the tank backed up on me so they got a fair amount of silt in the water. It was all cleared up this morning so I shut it down. How long is it safe to do this for? Yes I do have a ball valve in the return line and I pulled it out and checked , the arrow is heading in the right direction. Thanks for telling me the correct term, I'm hearing impaired so more than likely missed someone already telling it to me LOL. I do that alot.
So far as I can tell the only thing I'm missing is a tap in the return pipe. I'm going to put one in tomorrow night. It seems I should then be able to turn both sides down at once. Will that mess up the pump at all and is that one way to slow them down? I don't believe that could be causing the thumping though IMO
. I'll check that link right away, thanks for the help here.