aussienative said:sorry, i should also add IMO i don't think its his responsability to teach people how to care for fish.
You can't expect the breeder to teach everything, but they can suggest the buyer do some research. And they should offer some advice when asked. As for being rude, well, that is not doing themselves any favours. If they are helpful then they are more likely to get return business or some good word/mouth PR.
So it's his own problem in the end.