Id please, small twig like things in sand

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mikestanked

Aquarium Advice Freak
Joined
Jun 6, 2012
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289
Location
El Segundo, California
Over the last week I've noticed these small ( less than 1/2 inch tall, brown) twig like tubes sticking up through substrate. The are like the diameter of angel hair pasta if not smaller. Are they ok?
 
They look the same under the nightlight as they do in the day, just like little tubed twigs, and they bunched up in a group of like 30 or more.
 
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