Sun Coral not eating

[Bman10000]

So i fed my sun coral last night, and when ever food landed right on the polyps, it still would not ingest the food. Any Ideas why?

 

[username in use]

You're not giving us much to go on. How long have you had it? What are you feeding? Flow on or off? Any fish or crabs around? What are your water parameters in terms of Ph, nitrites/trates, ammonia, SG? What is your current flow around the coral?