Bro, Ozone not recommended for new reefer becos it will require precise dosage and constant monitoring of the ORP level... Overdose is deadly to the fish and harmful to human if it leak out..
I would recommend carbon if your water is brown, it will clear up your water...
For the browning of the coral, as what bro iskay have mention, it is light spectrum of the light tubes... It is most probably you need to change new tubes..