Contaminated Nano Phyto culture?

[rongy]

Hi, I just started phyto culture last month for nano. I harvest half of them weekly. Today, I’m checking the culture for the first time under microscope and found some string like substance. They don’t move at all, and I can still see some phyto in it. Anyone know what that is? Is it normal?

 

[formallydehyde]

I would guess they're cyanobacteria.

 

[rongy]

I would guess they're cyanobacteria.

Interesting. Has anyone seen this before? The culture still looks green, and been growing.

 

[rongy]

Picture of the culture last week