Cyanobacteria and light spectrum

[shoelaceike]

Has anybody found a specific spectrum that cyano not handle well? Like does it do better under blue, yellow, white? 20k,10k,

I did blackout but I still have a small amount left I want gone.

 

[twilliard]

Cyanobacteria is highly adaptive
A blackout will not eradicate them as they will find their fuel from sulfides.
So when it comes to lighting, they will adapt
These guys are smart

 

[shoelaceike]

Is there a certain spectrum that they don't tolerate well?

 

[twilliard]

Is there a certain spectrum that they don't tolerate well?

None that I have found
I can grow them out in any light condition.
Now maybe, hypothetically, they may not tolerate anything under 410nm strictly, but this is outside the normal conditions.

 

[WetWhistle]

I have not found any that really work. They can are capable of fixing atmospheric nitrogen out of the air so they can make up for wrong spectrum.

 

[reefwiser]

 

[Brad Courdt]

Is this safe for corals and fish? You just dose right into the tank and keep up with normal water changes and feeding schedules?

 

[twilliard]

Is this safe for corals and fish? You just dose right into the tank and keep up with normal water changes and feeding schedules?

Here is my thread on it
https://www.reef2reef.com/threads/back-at-it-peroxide-vrs-cyanobacteria.241002/


Welcome to the R2R community!

 

[Higgs]

Here is an article on the subject:

Blue light reduces photosynthetic efficiency of cyanobacteria through an imbalance between photosystems I and II - Photosynthesis Research

Several studies have described that cyanobacteria use blue light less efficiently for photosynthesis than most eukaryotic phototrophs, but comprehensive studies of this phenomenon are lacking. Here, we study the effect of blue (450 nm), orange (625 nm), and red (660 nm) light on growth of the...

link.springer.com

It reports that the cyanobacteria growth is not efficient in the blue part of the spectrum. Unfortunately it's only true at lower/intermediate light intensity (i.e. up to 100PAR or so). At high intensity the growth rate is comparable to the red and orange parts of the spectrum (I guess light is no longer a limiting factor at such intensities).
Will try to use blue light in my sump, where I have a bit of cyanobacteria - will see what happens.