Hi, guys
I have a few corals in my aquarium.(Xenia, Zoo, Elegant coral, and anemones)
Current nitrate level is around 10 ppm. Also, is this level of nitrate
really dangerous for my corals and anemone?
Also, I'm trying to reduce it with macro algae such as caulerpa in a 29 G
refugium, and denitrate matrix rock in power filter. Can I just wait for low
nitrate level without water change?
Is water change is the only way to reduce it in a short time?

Thank you for reading.
Sungwon