Please help ! Beginner with 700 Gallon Tank!
If the floor is concrete your okay. A regular wooden floor supported on joists might need to be reinforced. I had to add steel to my house to place my 300 in the middle of the room. I would put something down to set the tank on. Like a piece of plywood or osb.
Your right about the corals, but with a tank like this you could build a rock wall and get corals closer to the surface.
Otherwise, as X said, your in a great position to house many beautiful full grown fish without issue. I am so use to telling people their tanks are too small for that fish, it's nice to not worry about that.