if you have no livestock in your tank, just put the rock in and test the water after 2 weeks.
keep filter and skimmers on, as well as heat and lights.
after amonia spike do 25% water changes every 3-4 days.
keep testing water till all labs read 00000000000.
hold for 3 days retest and if still 000000 you are good to go.
it may take up to 3 weeks to cure some rock.
if you already have fish cure on other tank or plastic tub.
with powerhead for water flow.
heat, light and skimmer if you got'em
look on the web for curing LR youll get better instructions.
what ever you do dont put rock into an aquarium with fish, youll kill'em all......:scared: