Young garter passed away yesterday...

Unfortunately we found out the hard way that silversides are not thiaminase-free as advertised.   

RIP little guy.

Are you talking about fish feeders?

Yes, label is Sally's Silversides. They do have some thiaminase, not a lot which is why they're often considered "safe" compared to rosies.

Dang sorry to hear.

Ah that's a bummer, sorry to hear. I always though it was just goldfish to look out for, but good to know.

Goldfish/rosies do have very high levels of thiaminiase, which is very unfortunate as they're a common feeder fish. Stores carry them since they're cheap to produce, not because they're safe to feed.