I was getting close to purchasing some pre-cured and un-cured rock. I have read that u still need to cure it when you get it home.
Is this a new tank? Or are you adding this rock to one already established?
If the tank is new, the uncured(and cured for that matter) can be used to cycle the tank.
Any organisms subjected to the cycling process could die off. The initial ammonia spike is lethal to most critters good or bad. But amazingly alot of stuff lives.
The best advice I can give is clean the rock manually (scrub it) remove anything soft and squishy, usually sponges die off anyway so you might as well remove them now.
Don't be afraid to really scrub it well. It won't hurt it. Rinse it well with prepared salt water and put it in. Keep in mind this method increases the chance of unwanted hitchhikers! It only takes one mantis shrimp to raise h*ll in your tank and they as well as any critters can be hard to catch with all that live rock in your aquarium.
If this tank is established do not add uncured rock, the spike will harm or kill inhabitants. Cured rock can be added but do it slowly over time to allow your system to adjust.
There are MANY threads on this subject, do a search and you'll find more info than you could want.
Moby
