[QUOTE=coraline79;663445]I have small box of completely dry rubble. Can i just dump it in my fuge?[/QUOTE

yes, rinse then add . I get a small cycle when I add dry dead rock to my system.usually the new rocks will get some green film algea , sometimes a little cyano then it goes away after a month or so.After that the good stuff starts to grow coraline, feather dusters , sponge ect.