without oxygen? Arowana is a kind of fish that is not afraid of lack of oxygen, because when they lack oxygen, they will float near the surface of the water and put their mouths into the air to breathe the oxygen in the air. And when these fish breed, they rely on the foam they spit out to make nests. Therefore, if some oxygen devices, such as oxygen pumps, are placed at the bottom of the fish tank, it may cause their foam nests to be unstable, or even be directly dispersed, affecting their normal reproduction. So generally speaking, there is no need for oxygen. However, they may need oxygen in the young stage, because the respiratory system of young fish is not fully developed and may lack oxygen.
tank of Manlongyu Manlongyu likes a dark and quiet environment. Therefore, it is better to place the fish tank in a place with dim light, quiet environment and good ventilation. This kind of fish also likes to be in slower waters, so you can choose a bigger tank, put some broken stones at the bottom of the tank, arrange it like a mountain, and plant some algae to decorate it.
This kind of fish is used to living in the water temperature of about 26 degrees Celsius, and likes old water. When changing water, it only needs to change one third or one quarter of the water each time. The hardness is controlled between 5 and 8, and the PH is kept between 5.5 and 8.5. This kind of fish is a tropical fish, so you need to put some heating rods in the tank to keep the water temperature constant. The adaptability of this kind of fish is very strong, and the requirement for water quality is not high, so it is enough to keep good water quality when raising.
