Did it bleach? Was it more colorful before?
Typically people get colorful healthy coral by selecting colorful healthy coral. Dull coral choices will likely remain dull
What are you using for lighting? If there are channels, what are the settings at?
Best color is (imo) brought out with whites less than 3% and heavy blues
I don’t even use white, red or green led channels. I use my two blue channels + uv and have excellent results