My green water culture is no more. It got infected with rotifers and cleared up in a few days.

I went to plan B and tried some alternate feeds. Grahm Flower, Yeast Flakes, and Sweek Potato. Take any of them and put them in a blender and blend very smooth. Add just enough to the culture to make a light haze in the water. Do a 50% water change using aged aquarium water. Works easily.

The best for me seems to be a mix of 25% by volume yeast flakes and 75% sweet potato. I make up a quart and use it until I need to make more. Grahm flour is made from chick peas. By itself it doesn't work all that well.

Leave a little mulm at the bottom of the tank for them. It breeds bacteria that they can eat between feedings.