assuming there was lots of stuff that was on the rock that has died and will rot during the cooking process, using a product like startup *may* speed it up. the process of 'cooking' the rock to remove all the nasty organics is essentially the nitrogen cycle from start to a complete finish, with no addition of new organic material to keep the conveyor belt going along the way, so you're going to get a spike in ammonia eaters, then a spike in nitrite eaters, and then once all that solid waste has been turned in to dissolved nitrate and phosphate, you're going to suck it out with water changes until the rock isn't leaching any more of it. The bacteria that convert all that solid waste to aqueous nutrients that you can suck out with the water are the same ones responsible for the nitrogen cycle that keep our tanks alive, so adding them in the form of a product like start-up in significant quantity at the start might shave a week or two off the process.
Those bacteria will colonize and do their thing one way or the other because they're everywhere, but if you rely on mother nature to supply them you might wait a little longer.
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