ID, good or bad?

[aysnow]

Anyone have any idea what this is? I've seen about a dozen of these in my sump and overflow.

 

[cloak]

Amphipod. (good)

http://www.reefkeeping.com/issues/2004-09/rs/index.php

 

[aysnow]

Thanks Cloak! I thought it was a baby shrimp haha