Algae Help And Id Please!

[gt568]

Things were going so well, then I came home this weekend to find this filament like algae starting to take hold. Anybody able to tell me what it is and what should I do to get rid? Cheers.

 

[Liam]

Its staghorn algae, often caused by low Co2, overdosing excel is pretty effective. If you are dosing Co2 then checking the levels and raising them would stop it.