Female betta fish can be kept together in a tank, but the following points should be noted:
Tank Size and Decorations: A large enough tank is required, preferably between 20 and 30 gallons. This ensures that when fights occur, the chased betta fish have enough space to get away. In addition, placing some decorations such as aquatic plants and hiding places can help the betta fish find hiding spots when chasing each other, reducing the occurrence of fights.
Number of Betta Fish: At least 5 to 7 female betta fish should be kept. Only in this way can there be enough of them to establish a hierarchy. You can decide to keep more female betta fish according to the size of the tank, but make sure they have enough space.
Size of Betta Fish: Select betta fish of similar sizes. This can reduce their tendency to fight, and betta fish of similar sizes are less likely to cause casualties during fights.
Putting Them into the Tank at the Same Time: Putting multiple betta fish into the tank at the same time can prevent the situation where multiple betta fish attack one betta fish simultaneously. This helps to quickly establish a hierarchy and can reduce the frequency of fights.
Establishing a Hierarchy: When multiple female betta fish are put into a tank, they will chase and fight with each other. This phenomenon will last for about a week to establish a hierarchy. After the hierarchy is established, the betta fish will live in peace due to the division of ranks. If a tank already has an established hierarchy, it will be quite troublesome to add new betta fish at this time. The new betta fish will be attacked by the old ones, and soon the new betta fish will get injured or even die. The best way is to take out all the betta fish, then rearrange the aquatic plants and decorations, and let them establish a new hierarchy.