Are these hitchhikers algae?

sandersfish

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Nov 24, 2021
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Two month old 20 gallon tank. These two appeared on my myrio after two weeks or so. Can anyone identify them and will the fluffy, fern-like one kill the myrio. Picture attached.
 

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sandersfish

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Nov 24, 2021
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NC
Does anyone know the name of these two algae? One is feathery, the other is a single strand thread with "knots" every 1/2" or so. I would like to research them.
 

Allwissend

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there are many genera of algae that look the same with a naked eye. Even under the microscope identification is difficult. The type in the photo is usually referred to as green fuzz algae