You need to rinse it with tap until it’s clear
Two points about that:
It doesn’t kill bacteria off the rocks, tap water isn’t a sterilizer or lab techs wouldn’t need to use more to sterilize at the end of the work day. Tap water delivers bacteria, it doesn’t kill them in the way we’d expect
The ability to work with your new tank in a cloudless condition is priceless, the bacteria that are in live sand / caribsea are not needed. It’s in excess of the bacteria that cycling provides on the surfaces that count.
At no time is the bacteria in a sandbed the critical breakpoint in having ‘enough’ bacteria to run a bioload of fish and corals provided cycled rocks are in place, using the typical amounts
The rocks are always enough, we remove sandbeds from full running reefs all the time in the sand rinse thread. at no time do live rocks take time to ‘take on more bacteria’ in the presence of a sandbed being removed...not how microbiology works. The rocks maintained their own steady states the whole time, independent of the sand, and their surface area is enough says the bare bottom tank generation. This means you’re able to rinse your new sand in tap water until it runs clear. You’ll be inputting cloudless grains. Easy to move rocks around afterwards, ideal in every way and in no way is not rinsing a better option.