Nice purchase, I love to look of the Cube tanks. Unfortunately it is probably not big enough for a Majestic Angel, as they need at least an 80-90 gallon tank.
"Although the Majestic Angelfish is one of the smaller "large" angelfish, it still requires an aquarium of at least 90 gallons to comfortably grow into an adult."
http://www.advancedaquarist.com/2005/7/fish
Keep us posted on your progress!