Simply post a picture of your current tank pls
and post a picture of the rock you want to add.
Regarding reef water having cycling bacteria-Here’s us cycling a 200 g dry tank with only reef water.
EDIT: In conclusion, if using the method I did - connecting an established reef to a new system with dry rock (clean), I recommend the following: 1. Dose your new tank prior to connecting to your old tank with NO3 and PO4 enough to raise to your established tank levels. 2. Take your skimmer...
www.reef2reef.com
Cycling with fish isn’t bad, bottle bac protects them just fine we can see in all searchable threads. Using fish and bottle bac to cycle does not harm fish, it presents a disease risk to your tank by adding a non qt wet it‘em into the setup. Ammonia burning isn’t a factor.