See page 7 pics at my old Monterey Bay aquarium tour
https://www.bareefers.org/forum/threads/confirmed-monterey-bay-aquarium-tour-sat-june-16th-1-30pm-for-tour-pics-added.22095/page-7#post-325953
If the rock didn't smell bad when added I agree it probably was a contaminent or something else. If you looking for basic fish as replacements lmk maybe I can get for you from my orders.