Oh man that's alot of fish for a 9gallon with stock filtration, also unless you have a large pod population that dragonette will most likely starve if he doesn't accept frozen food. What is the filtration I think it's just some gfo or chemiclean and some wierd ceramic media? If so I'd recommend ditching the media use filter floss and try to implement a refegium back there. As for lights you need to have a certain spectrum for corals to grow, I'd recommend going to YouTube and looking up BRS and how they implement the ab+ spectrum on ai prime but also lower your settings down you don't want to hit your tank with to much light. Your nitrates are wayyyy to high, that is probably the main cause of your anemone atm. Although it could be from other contributing factors as well.
What is your salinity lvl and how are you testing it? Do you make your own saltwater? If so what do you use, if not where do you get your water?
Also I would avoid using testing strips with nano tanks, every test leaves behind some chemical in the water.