Ah, that sucks, sorry for your loss. I'm happy that the person has been upfront with you though, it would make it all the more distressing if someone had not admitted to their mistake and blame everything but the fact he didn't check.
It's been a bad week for fish in Orlando. Several days ago I lost the two pbass and black arow that I offered for your TSN. At the same time, I also lost my largest CK. They all died right in front of me (chloramines or a chlorine surge that reacted with some meds). As part of the fallout from the same incident, about an hour ago, the LMB also gave up the ghost