Gillies, as far as I know cooking live rock was not intended to rid your tank of aptaisia, but to flush out the nitrate and phosphate that fuels hair algae outbreaks. There are natural methods of ridding your tank of aptaisia, like a Copperband, or my personal favorite, Heniochus Diphreutes. Other Butterflies might also work. Peppermint shrimp I beleive are also effective. I have filled a syringe with vinegar and squirted small amounts on the pest and watched it burn up immediately. Don't use too much though as vinegar is acidic and could change your Ph. I beleive some people use Joe's juice for that as well.
Let's not change the focus of this thread. I only intended this post as info for Gillies. I hope this helps you.
No worries. The aptasia issue was four years ago and not relevant to me now. At the time I did it, cooking rocks was touted as being the answer to just about everything, including aptasia and the nitrate/phosphate issues you mentioned. Again, I tried it with no success for aptasia and found the necessity of stocking my corals and fish in a compromised system for such a lengthy period of time to be daunting and ultimately fatal to many of my best stuff. I'll end by saying to those interested in this method that they should give serious consideration to how they will successfully care for their animals while the cooking process takes place. Again, take the advice for what it's worth.