Aaron - how long have you had the chili coral? By GHA, I'm guessing that's green hair aglae?? If so, then you really need to address this first. The coral needs to eat, since it is non-photosynthetic. What are your water parameters? What is your flow like?
How do you have the chili coral mounted? From what I've read, they do best/long term survival hanging upside down. Also, lack of polyp expansion is most times due to lack of flow. You need to create good flow pattern going around the coral. Do you have a refugium? How long has your tank been set-up? Have you fed the coral any foods like cyclopeeze?