Yep correct in the 90s you got your coral and it was on a chunk of live rock . Not theses days every tank I have set up gets live rock never done dry rock . So for me live rock all the wayLate to the party as usual! I have only used live rock in my 17-18 years of reefing, always will. Back in the mid 90’s when I started every piece of coral I bought came on a new piece of live rock. After lights out I could sit with a flashlight for an hour checking out all the cool hitchhikers, it fascinated me. I don’t recall if I ever had dinos, I didn’t have algae ID info back then. I haven’t had any in my 17 month tank , excuse me while I knock on some wood. I do appreciate the awesome rock scapes created with dry rock but the esthetics do not outweigh the biodiversity of live rock in my opinion.