Hi all,
I wanted to give my goldfish fry an infusoria diet so I tried ( because its first time ) to culture them myself. I kept some raw potato in 1 Lt. water and kept it in sun , after 4 days the water became cloudy as I have read it has to be . but then no clear water appeared ( which would have been given the idea of presence of infusoria in the water ) . Now please tell me how could I know that the water is having infusoria in it and its safe to give them to my fry ? The water is having very foul smell .

Waiting for your valuable suggestions......