If you used wet rocks from another tank that had been running some time, you're cycledI’m kind of on the same boat, i bought a used tank, did a 100% water change last week and added 3/4 new live sand from my LFS. My tank came with aged live rock, water and sand.
My test results within the last two days ;
Ph 8
Ammonia 0.25
Nitrite 0
Nitrate 10ppm
Ph 8
Ammonia 0
Nitrite 0
Nitrate 10ppm
I’ve dosed microbactor for the last two days as well
-32G BioCube
I would not continue with the MicroBacter7 product. The rock not only has all the bacteria you need, but many of those bacteria products don't included the bacteria that we really want to grow long term. Think of them more like a band-aid, not a cure. They often included hetortrophic bacteria that are facultative nitrifying bacteria that *can* process ammonia, but do not always have to process ammonia. What you really want are obligate nitrifying bacteria that *have* to process ammonia all the time to survive. The rock should already have those desirable bacteria.
There's also no need to do a water change at this point. Typically, a water change after the cycle is suggested as a way to lower nitrate (which are often very high because people add too much ammonia), but your nitrate at 10 ppm is absolutely fine.
I would feel comfortable starting to add some hardy livestock. Good luck!
