Fish hobbyists may experience their aquarium being affected by sudden movements that cause some or all of its inhabitants to escape overnight, which is usually an indicator that something is amiss; too cold or too warm water, not enough oxygen, or perhaps there are environmental issues which have caused your fish to leave your tank and escape into space are just some possibilities that could cause this phenomenon.
Fish are known to jump out of their tanks to escape predators or search for sustenance, while some species even do this to escape aggressive tank mates.
Researchers have studied this behavior and discovered that guppies can make leaps several times longer than their body length. Furthermore, researchers noted that these fish often back up before leaping in order to gain speed and momentum - likely to ensure they safely make it into the air and splash back down safely into their tank after taking flight. It has even been speculated that this behavior serves an additional purpose, possibly protecting them from parasites as they splash back down again into water.
Your fish is less likely to leave its aquarium when there are plenty of hiding spaces and enough swimming room available for them. Most tanks may be too small, causing fish to feel cramped and uncomfortable, leading them to escape by jumping out.
