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Anything with surface area will jump start the cycle. Nitrifying bacteria colonized on the surface of the rocks, sand, glass, etc and not so much in the water. However, your current water has nitrates and phosphates in it, which in small amounts, is vital for coral growth. You will have a quicker cycle by just putting a couple cups full of sand in the née tank.
I agree with Cody. Add and cup of sand and a few rocks from the other system. There’s very few numbers of nitrifiers in the water column. I’d also keep the lights off for best success. Light will only fuel the undesirable algae growth in a new system. You can also run your salinity lower at 1.013-1.015 if you’re gonna be fishless with no corals for a while. This will speed up the cycle. Also, crank your temp to 84-85 degrees. Increased temp will speed it up too.
I did my 40 gallon like this. My buddy did a water change out of his 100 gallon we used half of that water and half new salt water. A few small rocks in with the filter media. A week later added a couple snails and some frog spawn and a rock with mushrooms and a Kenya tree. Two weeks later, put in the first fish, an emerald crab, and some hermits. Emerald died about a month later. Hermits and the clown fish are doing great. Corals are doing great as well as fire fish and lawn mower blenny I’ve added.
Just be ready to test daily at first and do frequent water changes if you add livestock before it’s fully cycled to make sure the bacteria is growing/keeping up with any bioload. I mean, that’s essentially what we do in qt’s... no bb, so frequent water changes and an eye on params. Good luck, and keep us posted on your process and progress
edit: I meant for qt’s that are being treated with certain meds that kill the bb.