Ok so I took about 2 years off from the hobby and i'm getting ready to start back up again. I've got 2-210 gallon tanks filled with what was once live rock. As we all know,live rock is very expensive so I would like to know how I could use the rock I've got so that I don't need to purchase anymore. If I buy the live sand,can I use that to "seed" the once live rock Should I buy a few pieces of live rock and let it seed the tank I am not concerned with time as I am in no rush and can wait to add fish and corals. It's more important for me to use what I have and save some $.