How do you fix long seaweed like this?

[aumwantanai]

Hello everyone.
I have a problem with long algae like this. I want to know how to fix it.
Is there any medicine to fix this?
thank you

 

[Mr. Mojo Rising]

Can you please post a pic in white lights? The pictures are too dark cannot see the algae, thanks.

 

[Gumbies R Us]

What does your cuc look like?