x_size = 30; // horizontal outer size of the aquarium pedestal.
y_size = 30; //
thickness = 10; // thickness of the pad bellow aquarium. hairs lenght is 12mm.
rim_height = 10; // height of upper rim for fixing the aquarium in position.
difference () {
rotate([0,0,45])
cube([x_size, y_size ,thickness]);
// cube([x_size - 2* thickness, y_size - 2* thickness, pedestal_height - rim_height - thickness]);
}
translate ([0, 0, thickness])
cube([sqrt(pow(x_size,2) + pow(x_size,2))/2, sqrt(pow(x_size,2) + pow(x_size,2))/2, rim_height]);