Then your hooking the motor assembley up wrong, when you put the screws back in you have to make sure its all sits flush like how it was, you must have too much tension on one side. And I know this sounds horrible but make sure the valves are wide open and all the clamps are secure.
You may have broken a valve while twisting and it stuck open, troubleshoot eveything. May as well clean the hoses and also you know that little hole where water goes into the impeller? Make sure that's not plugged.
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http://www.monsterfishkeepers.com/forums/showthread.php?504763-Cheap-plants-less-nitrate!-POTHOS
*Go S. Vettel #1 rb8--2 MORE RACES LEFT! SEE YOU IN TEXAS BOYS! LET'S MAKE IT 3 BACK TO BACK WDC!* :beer: