It is made to run 24/7 for years at a time.  On/off will wear it out. I have a 1250. The temp thing wouldn't matter at all (whether or not the pump stayed on, etc) . Pump on=water moving. Make no diff either way.
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Does a radioactive cat have 18 half lifes? --Kenny
my pimpin' rig: ...previously poorly cooled...
486DX-2 66mhz @ 75mhz, 4Mb ram, shared, 256Mb hard drive
Onboard VGA, watercooled, of course
16-color monitor, labtec speakers, 28kbs USRobotics modem
Windows XP (think about it)
Maze 3, DDen GF3 block, Eheim 1250, econoline van HC, 1/2" hose w/ 5/8" fittings Comair 172mm fan
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