Yeah. I remember. 4 stores. A rule I go by is that ANY fish with teeth come with the ability to eat shrimp and other inverts. I'm sure there may be some exceptions. Dunno.
Sorry you had to go thru that experience. But with it, I hope you learned a valuable lesson about listening to lfs
staff and not researching it yourself. We've all been there to some extent, but not making the same mistake again is the key.