I decided to move my MP40 last night. It was on the side, in the middle of my 90 gallon tank. I've been having problems with it moving a ton of sand, so I finally moved it. Still on the side, but now about 2-3 inches below the water level. HOLY COW!!! I'm finally able to turn it up, and wow does it move some water!! I was able to unplug both Koralia 1050's, and there are NO dead spots on the top of the water. No sand pulling over to the side, and on the opposite side of the tank the torch is really waving around. I love it all over again!! Now, I think I can vinegar at least one koralia and get a couple bucks back. SWEET! Now I need to figure out what to do with all of the sand at the side of my tank. It's almost 6 inches, and I'm afraid to touch it for fear of releasing something super toxic. Side note - wow I had a heck of a hermit crab graveyard under the sand!