Originally Posted by puffer9006
i thought they were precured though.
here's the thing. that rock is getting shipped a pretty long way. it isn't shipped in water, its shipped in wet newspaper. there will be some die off on the rock. this means that part of what makes live rock "alive"(it contains many different organisms) will not make the shipping. so if you put that in your tank, there may be some problems. there might be an ammonia spike in the tank, pH might drop, nitrates might be raised. however, you could let that cycle happen in a rubbermaid tub. that's what i would do. you could add the rock and not experience significant problems, but i wouldn't.