this is the exact trick to moving the stuff over correctly to a new tank
don't buy bottle bac, we're not scared of losing bacteria we move confidently and tell the man no to his safety bacteria we're not trained click baits lol
your sandbed isn't so wrecked with waste that moving it unrinsed would kill the setup...you need to rinse it because moving over any waste whatsoever doesn't benefit the new tank and is likely to spurn small amounts of gha or cyano/dinos in an otherwise very balanced system
though rinsing that sand for about 5 straight hours in sections, in tap water, until 100000000% cloudless then the final rinse per section is saltwater to evacuate the tap and prepare for use seems bad for the system, it's not. its the safest, best thing you can do for that investment. your sandbed bacteria are not positioned to help much in the tank, they sit on the bottom, not in a 3d contact plane with water, they sit on the bottom among muck sucking up 02 competing against fish. those bacteria complex around mud portions and make dense acid-producing colonies in bulk, that's the clouding that results if you stick a stick into that tank right now and stir it up
rinsed in sections, for hours, correctly, that never happens and the grains are 100% cleaned of waste, we don't care if bacteria remain on them or not for this crucial step. rinse until you think its clean, then rinse 3 hours more anyway. that clean, not 99.7% clean, 100000000% clean this is your skip cycle guarantee step...not transferring waste.
next up is rocks, just move them over nothing special
there is no reason you can't drain off 80% of that water and reuse it in the new tank, saving $$ go buy some brutes at home depot to use potentially.
match temp and salinity, don't go matching nine other params just those two, move the fish over. cover them when in holding/they'll jump out as you prep new tank
*ramp your lights up like its new, over ten days do not run full power on the new setup/bleach risk. the new tank will skip cycle just fine with these exact steps.