Thanks guys. I figured that I might end up buying new.
I was going to take the impeller magnet to work and try to turn it down on a lathe a few thousanths of an inch to see if that gives them more longevity. I had mine running for 5 years with no problem, and then one day - gone. I had to destroy the plastic around the impeller just to get it out!
I wonder how hot it must have got...
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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