What is this bug?

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I've been following this forum for a couple of years, but never posted before. Today when I did my water change, I found several of these black bugs crawling on the filter socks in the sump. Is this a copepod (didn't think they were black) or something more nefarious? Thanks for any help.
PXL_20230319_002101891.jpg
 
Looks like an amphipod....and yes they do get dark.
 
Printed Reef CaddyStack filter tower, Neptune Syst
Great! Thanks so much for your help!
 

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