Phytoplankton culturing

[Adzz]

Hi, I started culturing phytoplankton. Now on day 8 and I woke up today and my culture has gone a yellow colour but doesn’t smell. Is my culture dead or can I recover it?

3 images - Day 1 light green, Day 6 darker green, Day 8 yellow.

 

[Adzz]

This is how the culture looks on day 8. Realised I didn’t attach this image on the original post

 

[felpsgbr]

This is how the culture looks on day 8. Realised I didn’t attach this image on the original post

Add more fertiliser it might recover

https://www.rhs.org.uk/garden-jobs/fertilisers​