Can any rock be base rock?

[EcoReefer]

I always recommend about 10% Live to 90% Dry - you can do a higher ratio if you want but in my opinion it is a waste of money (save the money for other things you'll need for the system). It won't take long for the seed bacteria to colonize the new rock. The only thing that will take a little bit of time is the coraline algae coverage but in reefing those who take things slow and are patient tend to be more successful in the long run (just my opinion).