It's hard to say. Some will come out fairly quickly once water parameters get into the proper ranges. My reef's been up for over two years or so and I'm literally seeing some things for the first time now.
I'd go with the leads you're getting here. I got my rock through a local fish store. It was pretty nice but not as nice as the stuff I've seen available from reliable rock sources on the Internet. They generally have a lot more variety than the rock that I got locally, even if mine isn't bad.
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