1 join a good dedicated website!
2 select fish through dedicated supplyers and devoted breeders! the guy who breed the last fish advertises here on AC
3 get the best stock you can! it will give you the best start!
4 be ready to do as many waterchanges as you can! ( with good water)
5 be patient and watch your fish ........they wil let you know when they are not well! (this comes with keeping them )

Well said Pope, straight from the Vatican that was