Before I got my first rock, I had read about doing freshwater dips, high salinity and even using soda water in place of ro
If you are cycling your tank and you want everything off, do a freshwater dip. Some rock is pretty fresh so it might not even cause a cycle on it own.
I actually dipped my rock in freshwater after it had been in my tank about 6 months when I moved the tank. The mantis shrimp I had and the nuisance crabs needed to go. I got every crab and the mantis off with a FW
dip of about 1-2 minutes. This will kill some stuff but it is recovering fine. If the tank is cycling, stuff will die too.
, all the crabs and such came from my last batch of rock that I just placed in the tank. If your tank is already cycled and you have live stock, placing rock that is shipped is always a risk. You could dip it and then cure the rock to be safe.
Depends on what you want in your tank. Nuisance crabs grow very fast IMO