How long should I have lights out to fight algae?

[hybridd23]

I am going to try the lights out method to try and kill the algae in my tank. How long should I have lights off for? And do I need to cover the sides to keep any light from going in? And will the lack of lights hurt the plants? Sorry for all the questions, but I never done it before.

 

[doreenjoy]

When I did it, it was four days. Definitely put towels over the entire tank so no ambient light will get in.

My plants were fine but YMMV.

 

[Sorab]

For four days the plants should be fine, its a total blackout no peeking and not a drop of light, the blackout is very good at ridding a tank of blue green algae but not so good with other algae.

 

[msjinkzd]

3-5 days is what I have read.

 

[loaches r cool]

What kind of algae?

 

[doreenjoy]

I got rid of hair algae and diatoms.

 

[hybridd23]

Oh good, I am trying to get rid of hair algae and diatoms too.

 

[gregm]

What about cynobacteria (bga)?

Same deal?