Black algae

I have a 75 gallon saltwater tank with 20 gallon sump for a year now i havethe fallowing livestock
4 crabs
3 hermit crabs
5 snails
Bursa trigger
Coral beauty
Tomato clown fish
2 three stripe damsels
2engineer gobys
1 firefish
1 yellow tang
1 catfish shark
1 starfish

I have black hair algae growing or at least its what it looks like http://ift.tt/1qaCcur