Did I feed my fish something bad?

[StripySnailGirl04]

Hello,
I actually have another fish in a tank kept as a secret up until now. I was feeding it earlier with new food recommended by www/beheadeddeadfish.noonecares but now it is dead.

What could have possibly gone wrong?

Any help appreciated

 

[Back in the fold]

He's not dead, he's sleeping it off.

 

[Uberhoust]

Good pairing, today's dinner choice?

 

[Fishmanic]

They really thrive on Sam Adams