IMHO if your only up for 8 weeks I wouldn't go with grazers like dwarf angels,tangs or wrasses yet, although you can supplement a yellow tang with seaweed sheets so it might do OK. My royal gramma did well about that time and they keep you entertained by going in and out of the rocks and will eat pretty much anything flakes to frozen brinehsrimp. Firefish maybe. You are going to have a great time with that tank, I wish I had a 75!
If you have tons of green hair algae then I would go with a yellow tang or a lawnmower blenny. A yellow tang was one of my first fish because of the hair algae. I do supplement with dehydrated seaweed.