The only icp i sent in was the one i posted in this thread which was from last summer and it does show some tin, I'm not sure if a neodymium has tin though. I'll probably send in another test and use triton this time.
Ah, shoot man, I am sorry i did see that test you posted before. I should have scrolled back. lol I'd say, either way, the magnet is more than likely suspect with that much of it actually gone. It had to have entered the water column in some form. Have you seen any improvement since the rusty magnet was taken out?