Brown algae covering coraline algae?

[Pimba]

My tank has been running for just over a year now. I started growing coraline algae a few months ago. However recently I increased the light duration from 6 to 9 hours and I could see this brown algae now covering the coraline. Are these diatoms?

diato?

 

[thatmanMIKEson]

My tank has been running for just over a year now. I started growing coraline algae a few months ago. However recently I increased the light duration from 6 to 9 hours and I could see this brown algae now covering the coraline. Are these diatoms?

diato?

Does it blow off easy? It looks possibly like cyano