I at one time wanted a bow front tank so bad, but I am glad I use strai front. Because when comes to cleaning off those green film growing on glass, bow front would make life miserable, or at least to me.
Your Pagoda cup will hate your emerald crabs bad later on cuz those crabs when they get to a good size, they go nuts, especially if you don't continue providing them algae sheet and food.
I got rid of my 2 emerald cuz they started to munching on my corals.