White Scum On Top Of Water

[johnor21]

Hi i,m hatching killifish eggs in small tubs of water and peat. I keep getting a white scum on top of the water surface. Does anyone know what it is and how to prevent it??

Thank you in advanced, John.

[Indian Woods Angels]

Bacterium, you need to agitate the waters surface.

[johnor21]

Thank you for your quick reply.