zoa eating nudi's

[cuz]

the revivie seems to be taking excellent care of the nudi's along with a solid visual for eggs. All zoanthids will stay in the frag tank till the dt is empty of zoas/palys. my only concern is the rockwork, It is possible for them to lay eggs on rocks, glass or anywhere they travelled. I don't really want to pull sps colonies off rocks to dipp the rocks and visually seeing eggs on rock seems neer impossible.
Do i leave all food source out of the dt and let them starve out?
how long?