What is the difference between the living conditions of algae at the bottom of a pond and conditions at the bottom of a fast stream?

What is the difference between the living conditions of algae at the bottom of a pond and conditions at the bottom of a fast stream? Which algae body shapes are more appropriate for each case?

A pond is a deeper body of water than a stream and the flow of water in it is slow, but in a stream it is fast. Therefore, algae have adapted to life in different bodies of water. In the pond, the multicellular algae are longer; there are many unicellular algae growing in the coastal zone or in the pond.
Due to the small amount of light, algae in the pond are concentrated closer to the surface and often they do not need attachment organs – rhizoids. There is a current in the stream, so the algae must have attachment organs and be located horizontally and be threadlike so that the current does not carry them away.

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