That is the wrong attitude to have. Pet shops should be able to sell any fish in the world. It is up to the buyer to be a responsible buyer and know the requirements of the fish your getting. IMO if you can't research a pet before you buy it you don't need to have any pets. Simple as that. If I am going to get a gaboon viper I am going to research all about it, were anti venom is and how to keep anti venom in home. I am not going to just go to the reptile show on a Fri night and bring one home and then ask... now what?
I can continue but do to some things going on right now I won't.
I will say this though, congrats to the op for actually asking about it before doing it. Now he can have happy fish and not be in a situation with a fish he has grown attached to and has now were to put it.