What are these free moving white specks?

[GGhana]

Had some fish die from an unknown illness. I forgot to plug the wavemakers back in last night so water was standing all night and this morning the tank is FILLED with these free swimming white specks. What are they? How do I get rid of them?

 

[Aiptaisia anemone]

A healthy population of copepods

 

[GGhana]

A healthy population of copepods

Thank you! That's definitely what it is.