wait, and monitor. Mike ships the rock well, so there should be minimal die-off. You still could get a small ammonia spike, so wait a week or two to be sure.
what I did was add some fish food every day so there was something to decay and create ammonia>>nitrite>>nitrate...and also in case the creatures needed a snack.
after a couple weeks, i had some nitrates and no ammonia or nitrite, so I felt I was safe to introduce the first fish.
Former advisor and planted tank geek...life's moved on though.