I have that same pump also. Mine has ran hot from the moment I plugged it in, and it stills runs hot! I run mine about 12 hrs a day, and have since I've had it. Actually, it ran 24/7 the first couple of weeks. It's been running almost 2 months now, alot longer than I expected for $40! I ran a 50' 5/8" garden hose from the pump to the same diffuser as Eric mentioned, and have had no problems as of yet.
