I bought a half cup of chaeto in July 2021 and it grew like crazy until recently it crashed into a pile of mush. I was removing between a softball and volleyball sized gob every week. Phosphate and nitrate has never been detected in my ATI results but there must be some as I have quite the hair algae crop in my tank and the chaeto grew like mad. It did put a dent in the hair algae and I was just getting animals that eat hair algae. I didn't change anything. Any ideas?