Likely cycled in 2-4 days with Dr. Tim’s.
50% water change will drop her to 50ppm.
50ppm, fish don’t care.
The add on the ninth was fine.
You’ll need to manage both N and P from this point so pest algae is kept to a minimum through the next few months.
You can manage your 50ppm nitrate by either increasing your hard surfaces, and/or carbon dosing as a couple of examples.
For new systems less than one year old, Nitrate 2-10ppm, phosphate 0.03-.1ppm.
Stabilize all chemistry before adding corals, then consider softies first, LPS next, then SPS.
With no skimmer or fuge to mop up nutrients, you’ll need more frequent water changes to compensate.