What are these, there’s thousands

[Phishguy3.0]

They are almost too small for me to say what they are. Some look like they have a single body while others look like they have two sections. Thanks for your help

 

[SHNICI]

They are almost too small for me to say what they are. Some look like they have a single body while others look like they have two sections. Thanks for your help

some sort of copepods, come from LR (introduced) or from life food you feed, almost everyone have them on the glass who don't have fish eating them. Good they are I think.