I have free base rock that has been in cycling in my tank without fish for over a year. So it would have to be reseeded or used as base rock. We do not have time to take care of the tank anymore. There are some pretty big pieces, the tank is 100 gallons and holds a lot of rock. I am giving the rock away for free to someone who is just starting up their tank, since the rock must be cycled. I live by laquardia airport in queens ny, if anyone is interested please let me know. Turning my tank into a terranium.