You'll catch more flies with honey.
What is your:
1. Lighting
2. Height
3. Flow
4. Temperature
4. Salinity
5. High / low nutrients. (water chemistry ie. Ca, Alk, Mg, PO4, NO3 etc)
Any and all of these will affect the colour, growth and health of a coral.
A picture is worth a thousand words.
I've had this fiji toadstool for a few years. It looks nice but has been slow to grow. My system is well outlined in one of the links in my signature.
