Frequent and regular water changes.
A lot of people say 20% or so every couple of weeks. I have been successful with my reef systems doing large biweekly water changes. I'm consistent with cleaning my skimmer and changing any filter media I use out. I use RODI
water and I make sure those filters are changed as needed. I use IO Reef Crystals salt mix and have for years with great results. The salt debate is touchy so what ever you use is up to you.
The important thing is to keep your system balanced and be consistent with your upkeep.