Fish parasite or amphipod larvae?

[mc-nuggs]

Found two of these guys near my scorpion fish. One was on him and the other was on the glass near him.

I'm glad that they are not flatworms. They look like amphipods and are maybe 1.5mm in length. The following images I took with my microscope.

Any experts out there know if these are fish parasites?

Blue thing in the first picture near the legs is lint.

 

[ISpeakForTheSeas]

Found two of these guys near my scorpion fish. One was on him and the other was on the glass near him.

I'm glad that they are not flatworms. They look like amphipods and are maybe 1.5mm in length. The following images I took with my microscope.

Any experts out there know if these are fish parasites?

Blue thing in the first picture near the legs is lint.

Neither - that's a Tanaid, and it's essentially harmless:

This is a Tanaid - they look remarkably similar to Anthuroidean isopods, Ingolfiellidean amphipods, and amphipods from the taxonomic parvorder Corophiidira.

You can tell this is a Tanaid because of two main features:

-The claws (called gnathopods for all of these critters); only Tanaids have the "crab-claw" style gnathopods (i.e. where it has a pincer with two claws instead of a just a hook with one).

-The tail; Tanaid tails are not split, and they are heavily segmented with smaller segments than the rest of the body.

It should be harmless.

Tanaids are generally scavengers, eating detritus/herbivores, though a few eat worms and copepods;

 

[mc-nuggs]

Neither - that's a Tanaid, and it's essentially harmless:

Thank you so much for your answer! I was freaking out thinking about putting all my fish in quarantine.

 

[ISpeakForTheSeas]

Thank you so much for your answer! I was freaking out thinking about putting all my fish in quarantine.

Happy to help!