What is this, and is it bad for my tank.

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reef_junkie

Aquarium Advice Apprentice
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Aug 3, 2015
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ImageUploadedByAquarium Advice1470353240.231977.jpgImageUploadedByAquarium Advice1470353278.380093.jpg

I found all of these little guys all around my overflow and was wondering if they are bad or beneficial for my tank, and if these will grow big and clog my overflow drain/return.

Thanks


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Are they good for a tank?


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