Pest id looks like an isopod?

[A Young Reefer]

Any idea what these are and if they are harmful? They are living under my gonioporas skeleton and it seems that there are a couple of them.
Video taken with 3x zoom.

 

[SaltySam09]

Maybe an Amphipod?
Not sure though the half brown is kinda confusing me.

 

[ying yang]

Yeah looks like an ampripod and head is to right of your picture .

https://en.m.wikipedia.org/wiki/Gammarideahttps://en.m.wikipedia.org/wiki/Gammaridea

 

[ying yang]

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com

Ampripods in this guide and some other common hitch hikers for you

 

[vetteguy53081]

Either Sphaeromatid Isopod or ampripod

 

[A Young Reefer]

Are they bad?

 

[JoJosReef]

Are they bad?

Sphaeromatids, no. It is the creolanids you want to worry about, as they parasitize fish. They will have bigger eyes that are closer together, whereas the sphaeromatids have them smaller and further to the sides. The latter can also curl a bit like a roly poly, whereas creolanids can't (I read). The creolanids actually look more ominous.

 

[JoJosReef]

Are they bad?

Here is my sphaeromatid pic from top view. Was a bit of research before I stopped panicking that my tank was full of parasites.

 

[Karen00]

Sphaeromatids, no. It is the creolanids you want to worry about, as they parasitize fish. They will have bigger eyes that are closer together, whereas the sphaeromatids have them smaller and further to the sides. The latter can also curl a bit like a roly poly, whereas creolanids can't (I read). The creolanids actually look more ominous.

You're right about the creolanids looking more ominous. Seeing pics of those parasitizing fish is the stuff of nightmares.

 

[A Young Reefer]

Update: today I was changing my media bags and found one on them. Clearer images I thought I would share.

 

[ying yang]

Yup gamma ampripod

 

[Lividfanatica]

Yup gamma ampripod

bit of a type-o there ... but yes, some species in Gammaridea https://en.wikipedia.org/wiki/Gammaridea

Totally harmless and beneficial fauna for your aquarium! I believe they are primarily detritivores.

 

[ying yang]

bit of a type-o there ... but yes, some species in Gammaridea https://en.wikipedia.org/wiki/Gammaridea

Totally harmless and beneficial fauna for your aquarium! I believe they are primarily detritivores.

Could say yeah was spell check that changed it and I knew exactly how to spell it but would be lying ( without double checking and knew gamma would get the op to it)
But shhhhh don't tell no one ha ha ^_^