Layer of scum on water

[Itd59]

Hi looking for advice i keep getting a very thin layer of scum on top of saltwater aquarium, I a trying to remove it have tried with small net but the net is not fine enough to pick up the small
particles any ideas advise please

 

[vetteguy53081]

It is due to lack of surface area movement. Water needs to be forced to overflow.
If no overflow, aim a powerhead towards , not at the water surface and also a hang on back power filter which will circulate on the surface

 

[NatureHold]

It is also due to organics/nutrients in the water most likely from feeding. Are you running a protein skimmer? If not, that would be why you are getting the buildup.