I think a good hobbyist with regard to the koi hobby is one who cares first and foremost for his or her fish. They make sure that their koi are provided an environment that is not over crowded with room to grow in good water quality. They provide proper nutrition making sure the food is of good quality, but do not over feed. Plus, they share with others a good testimony of how the koi hobby is beneficial to their life and encourage others to participate.