One male is guarding an anubias leaf that has a bubble nest under it- now I’m editing this post to say he swam away and ate artemia so maybe he is not guarding anything other than an empty bubblenest. The female seems like it’s hiding from him so must not be ready to breed.
Also editing to shorten this to the question I previously wanted to ask- how are rotifers cultured? Do you use green water or do they feed on detritus and can you establish a population in a tank that already has copepods and other competitors? Or is it typically just daily harvesting of rotifers and targeted feeding of the fry?
Also sorry I never used the thank you feature, other people are using it and I never did after having asked so many questions!