Ok so after reading a couple diffrent threads I am still not sure i understand. I have read that i can supplement some of my live rock with base rock. So i am just wondering does this meen that if i need 100lbs of live rock in my system i can buy 75lbs of base rock and 25lbs of live rock and all the base rock will become live? Also i have been looking around online and it seems like if i need to buy all live rock it is going to be realy expensive. I have been seeing prices from 4-11$ a pound. that is a huge price diferance how do you know what to get?