It should be added from the start. The more cured your rock is the quicker your tank will cycle. If you buy uncured rock it could be up to a month before your tank will be cycled. I bought uncured and it took my tank 2 1/2 weeks. But the rock wasn't in bad shape when I got it.
The water does not filter thru the rock. It is a biological filter. What that means is that It has good bacteria that is already in the rock. This bacteria helps to take the nitrates out of the water. The more porous rock you have the more area for it to do this.
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