[microscope video] ID this critter that “may” have caused tank crash

[mzlskink]

This critter is white, tiny can can see with naked eye with wavemaker off, I have two videos one is in black container, at 1x zoom that eyes can see

Other is microscope video showing this critter (are they marine ostracods with more legs?)

It is crawling everywhere in tank, also crawling in acros that are dying

 

[taricha]

marine ostracod for sure.
I wouldn't think they are to blame for anything bad that happens in the tank though.