help with Id

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I have some wierd stuff growing in the tank. The largest clump of it is in the bottom of the overflow. It looks like roots and its a clearish brown any ideas. I also see some on the rocks

 

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Its sationary and never moves I dont think its any type of pest nems but its just random throughout the tank

 

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[shrimpy brains]

Forminaferans, I think that's what it is, and I"m sure I spelled it wrong! lol

 

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whats that??

 

[shrimpy brains]

:confused2: Sorry, I've been working alot. Here's a link to a decent description.

Note: they come in many color forms. Yours look different from these particular pictures, but I have seen pictures before the look lke yours.