Green hair algae

[aquajeep]

my 75 gallon has gha slowly taking over.ive tryed to lower nutrient levels but did not work.i have a green emerald 7 bl hermits12 snails but snails only clean glass hermits up to 2 inches from sand bed and i never see the emerald unless he sheds. do sea hares climb rock.?half my rock is covered in nice green bristle like algea then gha on top.not much to hold on too.yellow tang looks like a better choice for picking between polyps...but i heard they pick on my xenia and anthelia.??