I have a sen 900 that is less than 6 months old and about 4 months use on it. The impeller magnet is totally cracked already. Has anyone else had this problem? This has to be the quickest pump failure in my reefkeeping career. The worst part about it is that Won Brothers will not warranty it at all. In fact the lady who i spoke to was fairly rude and was tough to understand. She actually hung up on me at one point. I would think an impeller magnet should last more than 4 months. Sorry for my rant but i am angry at Won Brothers lack of support.