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Infusoria are tiny single-celled microscopic organisms, sometimes called rotifers, which are often cultured for use as food for newly born fry.

Simply placing a volume of clean water along with some organic matter, such as a banana skin or lettuce leaf, in a warm and well-lit area, can culture Infusoria.

The water will go cloudy at first but will clear after a few days, this is when the infusoria have grown, and the water can be siphoned into the aquarium containing the fry.

Because the process takes a few days to achieve, it must be started before the fish are born, which is not always easy to predict. In modern fish keeping, the process of culturing infusoria has been largely replaced by off-the-shelf feeding solutions such as liquid fry food.

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