RTR wrote:There is no reflection visible to the fish unless you put a mirror up against the glass. With water in between the two glasses at right angles. That is an optical illusion from looking diagonally through air through one glass at a second glass at right angles to the first with water in betweenm the two pieces of glass. It is all a function of the refraction of light through glass, air, water interfaces. The fish does not, repeat does not, see another puffer.
Hang a mirror against one end glass and the fish will see his own reflection. That is used to get male Bettas and male Cichlids to display.
The light angle effects are used in Monaco-style aquariums to make the side walls disappear when you look through the front glass.
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