whats your water paramarers like and what are you feeding?
I find with mine, they really coloured up with a lower ph and good water change schedule.
Feeding shrimp with the body shell (no head or tail) also helped along with a staple of hi quality pellet food.
I feed jumbo krill and prawns. My ph is 7.0 tank temp is 86 and i do about 25% water changes every 10 days. my other 2 peacocks have awsome color and my arow's are sweet. I just thought this guy would have better color.