I feel that medicating everything "just in case", running UV sterilizers and even going so far as weekly 100% water changes like some discus breeders is doing nothing to help the hardiness of livestock.
If the fish don't build a healthy immune system early, they're not going to withstand stress well in the future.
I get healthy fish with good colour and finnage by doing small water changes weekly, using lots of fast growing live plants (water sprite), snails, scuds and microfauna in the tanks.
I have similar tap water to what Cory has and I use 1tbsp of reef salt per 5 gallons to help with minerals and keep parameters stable.
I don't get multiple hundreds of babies like some angelfish breeders do but I do get around a hundred healthy fish with very few culls by the time they're ready to go to the store.
It might not work for everyone but it works great for me.