Questions - Need some input

Quick question, I've heard people talk about cooking rock to get all life off of it, what is the best and safest way to do this? I have about 40 pounds of rock I want to take care of. Thanks.

I'm going to be ordering a T5 retrofit kit to put into the canopy I'm building for my 60"X18.5"X19" OceanView RR tank, should I get a 6 bulb 48" kit or do you think I will be able to fit a 60" kit in there? Thanks in advance for any suggestions.