Nope, no spare pumps laying around. And I did blow another fuse this afternoon and no, I'm not giving you $10 for one!
This thing is quickly becoming a pain in the butt! I may, for now, swap the MAG 12 return pump with the 7. The tank can survive for now with 500gph return, and then I can use the 12 for the chiller. If that still doesn't do it, there will be a chiller for sale in the 'for sale' forum!!