I have a pair of gold and green severum mixed with my other cichlids in a 221gallon tanks. The gold one definately stand out but you should know that the imported one from Taiwan are much better looking. The pair i am having from Malaysia does not have the orange strip that appear over the body when they get mature.
However, you have to give them high protien food to ensure their true color appear. I feed them with frozen red worms, small feeder fish and mostly Hikari spirulina pellets. But lately i have also been feeding them with frozen cow heart.