I have just brought home live rock with some mushroom coral e.c.t on its been left out for about half hour while I've been mixing water with salt e.c.t the water is still freezing while it is still waterming up, haven't even put sand in yet, I thought I better put live rock in before coral on it dies, even though water cold and salt still at bottom of tank, did I do the right thing or should I have left it out for longer? The wave maker and pumps and heater all on in tank just warmin up now!???

