Adding Live Rock to Established Aquarium

What is the procedure to adding live rock to an established aquarium?
The rock will be purchased from a local fish store and is cured.
I have a 90 Gallon tank with 80 lbs of existing rock and I want to add another 30 lbs. there is a 3 inch sand bed.

I will need to dig out some of the existing rock and reposition it.

Do I need to take my existing fish out before I dig in the bed?

Fisk load
1 hippo tank
1 long nose hawk
1 clown
3 shrimp
1 statr fish

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Adding Live Rock to Established Aquarium

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