Hey guys, I have a rio pump that is 5000LPH, and it was working perfectly the first time i tried it. and then it sat in its box for a couple of weeks while i did a few modifications and stuff on the tank. then the other day i connected it as my return and i got absolutely nothing out of it. so i disconnected and tested it in a bucket of water and i am getting no water movement at all. so i opened it to see the wheel etc and with at bit of fiddling it worked for about a second and it pumped fiercely again. i dont know what i did and i have no idea what is wrong. can anyone help?