The Light-up Rainbow fish is a nekton, meaning that it moves around by swimming. It uses it's pelvic fins to not only swim against strong currents but to also have the ability to attach to objects if need be. They also have the ability to take different positions along the fish's surface.
The Light-up Rainbow fish has to make sure that the same amount of pressure with their bodies, is the same amount of water pressure that is outside or else they would not be able to survive. Water pressure increases every 33 ft in depth so this is why animals such as the Rainbow fish must be able to withstand the tremendous amounts of pressure that are faced.
Because food is so scarce in the Abyssal zone, the Light-up Rainbow Fish will feast on just about anything in order to satisfy its appetite. Many of the animals that live in this zone are very small in size, causing the Rainbow fish to need to eat large amounts of food in order to survive. The fish often uses its bioluminescence to lure its prey in then swallow them whole. It also tends to eat what is left from animals in zones above them, such as the leftovers from sharks or whales, which may include smaller fish, invertebrates, fish, shrimp, plankton or even crabs.