This is not a-typical for this kind of coral. They are opportunistic feeders who harvest planktons and such at night. SOME, but not all, will change their habits once acclimated to your system. When they 'realize' (if a coral can do that) that feeding time is during the photoperiod, they may change their schedule to fit their needs.
It's almost like bringing home a newborn baby...it takes some time for them to figure out the day/night thing 
Dave
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