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 saltwater 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

You can add new sand to your existing live sand as long as you clean it first with non-chlorinated water, and mix it up with the existing sand. The microbes in the existing sand will colonize the new sand fairly quickly. If you can get live sand, that works even better, but in my opinion it is an unnecessary

I read an article/or website a while back that made sense to me, When adding new sand, pile it up on a corner of the tank and let sit for a week or so for bacteria, THEN spread it out. This keeps the critters in the rest of the sandbed surface area happy till the new sand gets seeded.

And repeat till you get the depth you want.