Here is my new aquarium design, is meant to simulate a tidal stream, The water is moved using wave makers in a clockwise direction for 6 hours and then a counterclockwise direction for 6 hours. The round and or deep zones are meant to be similar to how zoos create areas to stimulate the animals instead of just keep them in a square cage or box. The 24" rectangles could be lengthened to 48 inches in the smaller incarnations. But the rectangles connecting each cylinder should be the same length as the diameter of the cylinders in large versions.
This is the smallest really practical size.