from my experience, curing live rock before you place it your tank is always the best thing to do. even if it has been cured, you can still use it to cycle the tank, there will always be some more die off until the tank is completely cycled. and the colors should eventually come back as the tank matures. at least mine did. i had some completely dead dried out rock that now has purples and greens on it. i didn't think that rock would ever grow anything but it has. and as far as the temp goes, i would definitely put at least one or two small fans on it blowing across the surface of the water, either on the tank or the sump(if you have one). this will bring the temp down a little before you get your chiller working. also cut your lights way back, you really don't need them on at all during the cycling period, especially if you have to wait for your rocks to cure. and as far as the critters go, if your worried about them i suggest you do the 1.03
specific gravity in a bucket thing. that is if your rocks arn't in a place that you want them permanently and would be too much of a hassle to move them, fill up a bucket with salt water approx. 1.03
specific gravity for about 10 sec and watch as the little critters come running out. do this with each rock and place them back in the tank. then, if you arnt grossed out, you can pick and choose which critters you want to keep, and throw the rest out. well ive said my speech i hope some of this helps.