They are non photosynthetic.. requires extensive feeding regime, normally these corals gets food during the tidal movement when the tide changes, so the food supply is quite consistant through out the day...
Best bet is getting a dosing pump for the dosing of the food if you are really keen in keeping non photsynthetic corals.. just provide food throughout the day, and provide a big skimmer to overskim and be prepared to battle some nitrate and phosphate problems..
Alternatively, you can do manual dosing of the food 8 - 10x per day, which is not feasible for most of us.. but still Nitrate and phosphate problem will will be there..
Bottomline, dont go into non photosynthetic corals if you are not willing to spend the extra effort in feeding them to keep them alive..