Originally Posted by ReefGuy77
I did not mistype my statement, dry rock does not become live rock without seeding it. There is not way to get the biodiversity on dry rock without seeding it with quality live rock. There is a lot more to live rock then coraline algae. If you want to use rock as a natural filtration, coraline algae on dry rock will do minimal for you. Also, dry rock that was once live rock will have dead organisms in the small cracks and crevices that you would never be able to fully clean out. This and coraline algae can seal the pores in the rock, reducing the biological filtration capacity.
Now with that said, back to mdub's questions, live rock is not necessarily required for a fish only tank, as long as you have some other filtration.
I strongly disagree I even seen cinder-blocks become live over time.
Dry rock will become live over time as the bb builds , seeding your rock will help encourage Coraline growth faster , the reason some use dry rock over live is to prevent any bad hitchhikers , dry rock will take longer to build bb but once you introduce fish inverts and coral things will change , yes live rock will cycle faster but dry rock will cycle it may take longer A nice size deli shrimp will help get you on the way , macro algae in the tank with dry rock can grow and start the life cycle of the rock , shrimps crabs , snails ect once they lay eggs help it along also , is one better than the other not really one just gives you a faster head start , in the end things will be the same,
this tank was all dry rock 6 months later it was flourishing with growth,
water was still murky when this pict was taken
It's not what you start with it's how you introduce things to start that life cycle , I believe this rock became as live as it could be
I so wish I never broke down this tank It was one of my all time favorites