I started a new tank, and I purchase some really nice live rocks with a deep purple coralline growth on it. I put in water and started the tank up , I placed a heater in the water to bring it to the temperature of the room. Once it reached temperature I added the rocks and live sand. I thought I turned the heater off but I didn't. So 24hrs later when I came back to check on the tank it was at close to 90 degrees with the heater still running. That was only two days ago. The rocks seem fine but I would like to know if any one with more experience can tell me if I killed off the coralline one the rocks because of the high temperature.