I did between 200-300 lbs in June and July, with the "package". Rock looks great. Tank cycled near immediately. I never got a reading of Ammonia, Nitrite or Nitrate > zero. Imagine that. Now for the cons....the hitchhikers. I got at least 8 purple urchins, which all grew to golf ball size in a matter of weeks. These are easy to remove. I got copods that killed at least two fish, but the colony does not survive for long. So I would recommend waiting a few months before adding fish. I also have removed two mantis shrimp thus far, and there is one still in the tank. As they grow, they get more brave and become easier to catch. I caught both with long tweezers. It is actually not that difficult. In both cases I caught the shrimp within a day or two of seeing it in the tank. The third one I just noticed yesterday. There are a ton of small crabs - stone crabs and gorilla crabs on the rock. They fall off when you remove the rocks from the boxes of water, but not all of them. I have removed 2 gorilla crabs from my tank that are 6 legged terrors. I caught the second one today. You pull them out (again with tweezers) and they hold on the the rock and the rock comes out with the crab - that is how strong they are. Finally, there is a pistol shrimp that I see occasionally but have no plans to remove. Other than losing a bunch of clean up crew, with the exception of the copods, these hitchhikers posed little to no risk to my fish and corals, at least from what I can tell. My original bristle stars, sea cucs, and peppermint shrimp from the "package" appear to still be alive.