Ok - to be more specific... I would dip the rocks to get out everything I wanted to keep... And then I'd perform ERADICATION

.
I'm on my first tank - day 21 today - used live rock and I've found a rare sponge that can move/walk, several pineapple sponges, a few filter feeders poking out of the rocks, several stomatella, a couple of little clam-like things, several asternia sea stars, and some other fun stuff. Tank has so many copepods at this point it's almost like snow haha... Nothing in there to eat them so we'll see what happens with that.
I'm following this thread - sorry to have seen about your tank crash.