Black bugs in tank?

BabyShark

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Recently discovered these black critters crawling in my tank. At first I only noticed a few, but tonight I decided to check on my tank hours after lights out and noticed a lot of them crawling all over the rocks and on some coral as well. It’s hard to take a picture so I attached a video link. Could anyone please help me identify these critters and if they’re a threat to my reef.

 
Fritz
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BabyShark

BabyShark

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Okay I figured they were a sort of pod! still fairly new to the hobby. Thanks for all the responses!
 

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