only if I'm naked

If the aquarium store clerk told you that the 'Shark Catfish' or 'black fin shark' would be alright to put in with lots of other tiny fish, would you hold her liable after said fish eats about $30 worth of tetras, minnows, dannios, guppies, etc? I mean, if her advice was wrong and it ate the other fish she sold you, by rights, shouldn't she be responsible for damage incurred by a fish which may grow to 20 inches instead of 6 inches?