How can I install a wall mounted aquarium on a plaster board wall?
I don’t see how you could do it without support for the front side of it to the floor or from the ceiling. We did this once using a wide varnished board connected to the wall with brackets (into studs) and hung two ropes from the ceiling which went through holes in the outside edge of the board and tied large knots in the rope on the underside of the board. The hooks for the rope had to go into the wooden beams behind the ceiling sheetrock. It was very cute in a beach cabin.