Adding Dry Sand to living reef?

Hi all,
I have a 75 gal. reef tank with about 10 gal in the sump. 80+lbs of live
rock and 50+lbs of live sand. Its home to 2 bubbletips anenomes and a tube
along with a purple tang,clown,foxface,goby and hawkfish. Sad bed is almost
3 inches in alot of places but much less in others. I would like to add some
more sand to even it out and make it a bit deeper. Most people recommend
adding live sand but all the live sand I can get localy looks nohing like
the sand I have in there now. I have about 75lbs of the original sand I used
in this tank still dry. I would like to use it. Can I just wet it down with
current tank water and add a bit at a time or do I need to possibly cure
some in a bucket and sal****er for a few weeks like with live rocks? I have
had success adding dry sand before and avoided getting alot of dust kicked
up but never tried with so many creatures living in the tank. My main
concern is kicking up dust and that somehow causeing the life in here
distress. Or creating a major amonia spike.
Any advice would be great.
thanks
G.