As said below, watching fish moves is hypnotic. So it shouldn’t come as a surprise that a vivarium also can offer you calming effects.
Studies show that just by watching your fish swim, eat, or play, you’ll be able to significantly decrease your anxiety level.
Not only adults but fish even have impressive calming effects on seniors and youngsters. Children with hyperactivity disorders, when watching the fish move, will feel less anxious and might even sleep better in the dark.