Identifying and treatment

[Anteiku]

Hello, I am very new to fish keeping and was wondering if anyone could help me identify this? its migrated to my other plants but this ones the most visible. not sure if its harmful or not etc.

Any help would be appreciated

 

[Colin_T]

Looks like blue green algae (Cyanobacter bacteria). It spreads pretty quickly and wipes off in a film/ sheet. It loves nutrients, low oxygen levels, calm water, red light.

Increase water movement, reduce the amount of dry food going into the tank, if the light is fluorescent and more than 12 months old, replace it with a daylight globe that has a 6500K rating.