My daphnia nursery is working well!
I'm still buying bags of daphnia fpr the newts and babies, and to try to clear my green water (which is now improving), but I have a daphnia nursery up and running.
It is a plastic storage box which I filled with seived green water from my stickleback pond (didn't want any fish in it).
I added some daphnia and an escape stick and left it for a few weeks.
Now when I need daphnia I get my tiny white aquarium net with small white mesh and swish it around a few times. I get a small amount of very energetic daphnia which I empty into the ponds.
My new pond is beginning to clear (I can see the plants at the bottom again), and I can see the daphnia, so lots od food for the newt efts I have transferred into it.