Hey guys i was wondering if you could shed some light on some things that have me concerned...

First of all, Activated Carbon. Is this good? Bad? for your discus tank? Is it unnessecary? It is just supposed to make the water crystal clear isnt it?

And secondly i am starting to notice a fair bit of hair algea latching onto my plants... Is this bad for the fish in anyway? How do i go about removing it? Treating it?

Thanks for your advice