Keeping aquarium fish can be a surprisingly relaxing and therapeutic experience. Studies have shown that observing fish tanks can lower blood pressure and heart rate, contributing to a calmer state of mind [1]. This tranquil effect is likely due to the combination of the gentle movement of the fish and the calming presence of a miniature underwater world.  Aquariums have even been shown to reduce anxiety in dental patients and improve mood in seniors with dementia [2, 3]. So, if you're looking for a way to de-stress and add a touch of serenity to your home, a well-maintained aquarium might be the perfect solution.

References:

[ 1. National Library of Medicine]

[ 2. Science Daily]

[ 3. ESA Doctors]