Hi Bud. you can always tag me
@saltyfilmfolks
Here's what I do.
Get several clean buckets and containers (small tanks etc )ready. Depending on temp you may need a heater and a couple power-heads.
Yea you have a new tank so itll be a bit easier.
Drain the tank water into the buckets.
Drain it down to where you can catch the fish
remove livestock into the buckets containers
gently swish the rock to get any funk off. you can also use rodi if you have any to spare
remove rock.
put some rock into containers with the fish.
make sure you put powerheads in all containers with rock and fish(some folks recommend a hob filter with a sponge soaked in your tank like a qt but I believe from research and experience the rock is fine
drain the tank down to the level of the sand bed.the water is probably gonna be a bit funky there so dump it.
remove the sand into a buckets and rinse with old tank water or new or rodi. (we are in SD so we have ocean water free)and no it wont kill the bacteria.
put the clean sand in the new tank, add new live if you need too(some dry is fine but I would not ad more than 25%)
put rock in tank. put old clean water in tank put fish in tank

top off with clean fresh salt water.
After the transfer monitor Ammonia and ph. Have an airstone(for PH) and bottled bacteria(for Am) standing by.
Keeping good flow in the containers will help the bacteria to breathe, it would be best let the head ripple the surface for gas exchange and this will stop a bacterial dieoff.
Have fresh salt water standing by and a qt/hospital in case of emergency is always advised. (I keep a funky sponge in my sump and a hob in the garage just for this)
The only reason I advise ph is I had a funny thing happen for no reason on my last transfer, but i did clean several of my rocks with peroxide as they were pretty funky.
Fwiw IMO the only way you can cause a cycle is to let a shrimp rot in the tank and begin the nitrogen cycle or to add Dt and small doses of ammona.

Stirring up poop and detritus and toxic gunk from a dirty sand bed causing algae blooms is not causing a cycle or a mini cycle

mad

et peeve word).It is simply is stirring up funk and causing an alge bloom.
By slowly draining the water down to the bottom the before removing the rock, youlll minimize the funk you stir up and can avoid putting it in the new tank.