What is crawling on my rocks?

[JCOLE]

I just noticed there are very small black looking fleas crawling across my rocks. I recently did a water change last week and added some bio-spira bacteria. Never noticed them before.

I cannot attach a video otherwise I would show you

 

[Lovemyreef2015]

They're probably amphipods

 

[KJ]

Look like this?
https://www.google.com/search?q=gam...ved=0ahUKEwjyqZ61t6fJAhVIRCYKHXibDokQ_AUIBigB

 

[JCOLE]

Look like this?
https://www.google.com/search?q=gam...ved=0ahUKEwjyqZ61t6fJAhVIRCYKHXibDokQ_AUIBigB

Honestly I dont know. I need a magnifying glass their that small. Their just big enough to see them moving

 

[Maritimer]

They might also be munnid isopods.

In either case, they're mostly harmless - and your fish will think they're delicious.

~Bruce