I got mine from ocean floor and had to run gfo for a while. It was fine at first, but around the six month mark I started getting a lot of GHA. I seeded my 110g with rock and some sand from another members tank that has been running for 4ish years. This hobby relies on patience that I have had so far. With that said, I do wish I did a different kind of rock. Regardless, it is way cheaper than buying cured live rock.