Aro colour changes from time to time.. .my Banjar used to have red tone on its tail and fins when small,but after 2 years..it changed from red to orange to dark yellow.
Read that by using echancer to boost your aro will shortens its life span.Dunno how true but i dont want to risk its life to look good.
With a balance diet and TLC your aro will show its full potential
Was advice by some friends that MP(market prawn) help enhances colour of fish that eats them...you might want to it.