sand sifting sea star

[cityreefer]

just moved my tank its been reset up for a week and i have done the water change and checked all the levels( ph,kh,no3,amonna, and cal) anyway this morning my sand sifting sea star seems to be getting samller then i remember it being alot bigger, is it starving after the move i took all the live sand out and put most of if back.
wonding really what i can feed it or if i should just leave it alone?