Stone in an Aquarium

You have a tank of water, which does not have a top and whose bottom is flat. The side walls of the tank are vertical and can be of any shape (cylindrical, rectangular, etc.). You drop a stone into the tank and it sinks to the bottom. The stone has volume $V_{stone}$ . You then remove $V_{stone}$ units of water from the tank (so the water level of the tank does not change with the addition of the stone). How does the net force on the side walls of the tank change?