Appreciate the concern, guys! that's why this forum is so great...
I thought the weatherfish was a weather loach for about 4 years, but according to loaches.com I think it was a misgurnus mizolepis, based on its colour and head shape. however it never got to the full 10" (only about 5", probably from being kept in an 18x10" tank with 3 goldfish for several years).