Favia sp. weird activity

hello everyone,
i have a question about my favia brain coral. when i first got it about a year ago it was bright purple/pink and flourescent green. way pretty, and it always had its sweeper tentacles out at night which i honored with small brine. at about 6 months it declined with no tentacle extension and a fade in color. i rescently (last 2 months) moved it up in the tank and started feeding zooplankton/ little phyto also here and there. the color is back and beautiful with the tissue very robust. but the sweepers no longer come out, is this normal for a captive favia sp? the coral appears healthy but i am still curious about the sweeper tentacles.

 

Are you looking in the tank when the lights are out?

 

Ya, same ?

J

 

Same sort of thing is happening with my brain...it is very healthy but...the tentacles do not come out like they used to. when i first got it every time i feed the tank the tentacles came out

 

ya mine would be totally out during feeding also bruce. and yes i am looking at many a dark hours, observations never cease. so i am not sure, whats the deal with brain coral?