I bought a 10lb piece there the same day I bought a $35 heni. Two days later the heni was dead & the ammonia had spiked. They told me the rock was cured, but it wasn't. When I told the owner what happened, he said it was '90%' cured, and wouldn't give me any credit for the fish. It's a nice piece of rock, but I wouldn't trust that their rock is fully cured again.