I don't think so - except maybe a smaller piece now and then. I already HAD a bunch of extra rock in the sump of my 58-gallon tank. I put that, plus what I got from Steve in for my major aquascaping. The pieces I have added came from a 'buy everything I have for $600' sale. Rocks had been sitting in cold salt water for most of a year. But before I used them, I put them in a 45-gallon tank with lights and movement for many months. And just for fun - I checked that tank for nitrates some time back - they were LOW! Despite only one water change in over a year, a Psychlone skimmer, NO and PC lights, and one Seio powerhead moving the water. I have a VERY fine crop of Kenya tree coral growing in that tank, now.
bob