Overnight critter explosion

[TeaBiscuit]

A couple days ago I didn’t see any of these. Now, they are everywhere. What are they?
Thanks for the help!
Picture attached.

 

[Sharkbait19]

Amphipods
They come in on rocks, sand, and corals. They have been there all along, and just started to come out. There are a lot of them.
What’s good is that they are completely harmless and actually great algae eaters and detritivores, and are a favorite food for many fish and inverts.

 

[Karen00]

They look like some sort of amphipod but I'm not a pod expert. I'm sure more knowledgeable folks will chime in. I always find it amazing how these types of creatures explode in people's aquariums seemingly overnight.

 

[TeaBiscuit]

I did notice a few of a smaller version of these on some corals but then suddenly this bigger sized ones are in crazy number. The shot is just one part of many spots that have a ton.
Thanks for helping with you 2cents.

 

[ying yang]

Looks like munnid isopods to me.
I got same in my tank and my research took me to munnid isopod

Good guys

 

[ying yang]

These aren't munnid isopods but about halfway through video a little pod ( spider looking/ acting) comes out,I love watching all little bugs when lights out ha ha

 

[ying yang]

Found an old video of mine of a large ampripod ( some call scuds) catching a munnid isopod
Everything eats everything ^_^
At about 2 .10 onwards in video

 

[WheatToast]

Looks like munnid isopods to me.
I got same in my tank and my research took me to munnid isopod

Good guys

+1 on Munnid isopods, not Amphipods.

Munnid isopod (straight back):

Amphipod (curved back):