I wouldn't dip or leave live rock out side , when live rock dries out all that was alive dies then you put in your tank all the dead leaches out and can or may cause problems with the cycle and or break the cycle. this doesn't always happen but I would say more time than not you will do more damage than good. what you can do is set up a bin and put salt water in it and let it run for a few days and observe if there are pests u will see some and some you wont but you will be able to see and figure out a game plan . it also depends what you are looking for or trying to prevent . A LFS should cure and check the rock before it goes out for sale so that it Is safe for the customer. Here @ C.0.C. we cure before we sell and we inspect the rock . We cant catch it all but at least this service helps protect our customers time heart and investment