Can anyone ID these?

[tobster]

I was observing my coral quarantine tank this morning and noticed a lot of these critters running around under the blue light. Any idea what they are? Are they good or bad?
Thanks in advance!

 

[ISpeakForTheSeas]

Amphipods or similar "pods" - they're generally harmless/beneficial.

 

[EeyoreIsMySpiritAnimal]

I was observing my coral quarantine tank this morning and noticed a lot of these critters running around under the blue light. Any idea what they are? Are they good or bad?
Thanks in advance!

Guide to Common Hitchhikers in reef tanks.

The purpose of this thread is to hopefully assist hobbyists in obtaining the correct id and method of treatment to common hitchhikers. Both; the good ones and the bad ones. 1) Anemones: Some times called the flowers of the sea, many hobbyists keep them intentionally for their striking colors...

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