Things growing on wood.. identification?

ellamay

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I’ve noticed two different things growing on the spider wood in my tank. These little black dots and the light colour stringy bits. I do have black sand which I initially assumed the black bits were but they look slightly smaller and darker than the sand. A lot of it is attached all around the branches too.
I just wanted to check it’s not anything I should be worried about but mostly just interested! Any ideas? ?
 

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Slaphppy7

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I’ve noticed two different things growing on the spider wood in my tank. These little black dots and the light colour stringy bits. I do have black sand which I initially assumed the black bits were but they look slightly smaller and darker than the sand. A lot of it is attached all around the branches too.
I just wanted to check it’s not anything I should be worried about but mostly just interested! Any ideas? ?
Some sort of brown algae or diatoms, is my guess
 
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ellamay

ellamay

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After some more research im pretty sure the black one is black beard algae. I still can’t work out what the little stringy bits are though
 

Slaphppy7

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After some more research im pretty sure the black one is black beard algae. I still can’t work out what the little stringy bits are though
They almost look like roots...
 

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