Good idea! The rock did great. It is already encrusting with coralline and it looks live now, no white. Algae is growing nicely on the rock and no nuisance algae at all. I did not get a nitrate spike, but my tanks always run around 10-20ppm nitrates due to heavy bioload so I overfeed. I'd worry more about moving the sand then the rock. In fact, I'd get new sand and seed it with your current sand. The rock is the least of your worries it'll be great. I get my coral from a couple different places. Some come from local reefers in my area, some online (reef hot spot), but most from a local store called mainstream aquatics. He orders me anything I want from ORA and gives great deals. He sells online too. I put a bunch more in and am just about out of room. Picking up a few more SPS pieces then some from Acans for the bottom and then let it grow.