My daphnia container crashed and I'm waiting for green water to appear like usual but instead some species BGA took hold all over the surface of the container. I fed the daphnia spirulina, maybe it's spirulina?
Anyway, with the BGA taking over no green water at all for a month. There was a lone large ramshorn snail in the tub. I added more snails and their population boomed by eating the BGA. With BGA reduced and greenwater is back. Hopefully, the daphnia will follow.