Don't buy reef chili or other coral food. Just make some, its a lot better than bottled food. Just to to your local grocery store or asian market and buy fresh fish, squid, shrimp, clams etc.
Here is my recipe:
1/2 pound of clams
1 pound of black mussels
1/2-1 pound of bay scallops
1/2-1 pound of fresh shrimp
3-5 fresh oysters
I blend this into a paste which I can then feed to my zoas, sps, etc.
For larger LPS, such as duncans, I feed small pieces of krill, mysis, squid, or brine shrimp.