I ordered fresh rock and cured it in my tank, the right thing to do would be to cure it in the two nice empty 40 gallon water containers that I have, which I've done before. That way you can shake the rocks up and get the detritus off before putting it in your tank and keep your tank nice and clean. Curing it in my tank has left me with a constant film of detritus on everything and I have no way to get rid of it other than siphoning with water changes and getting critters to eat it which I don't have yet.