Loner fish will often fight for territory when kept together. Fish that do not do well with other fish, like Beta fish, will often fight with other fish for territory.
They want territories and they fight over it. They are greedy fish. They will fight to get territory
its the same reason that deer fight for the girls and for territory
Males will fight other males for territory and mating rights. All of them might fight over food.
The angler fish The Larry fish
Yes.
Male beta fish are very territorial. Two male beta fish cannot live in the same tank or they will fight. Male betas make bubble nests to mark their territory.
No becaUSE THE MALE BETA FISH WILL FIGHT TO DEATH.
if female beta fish are put together they would start to fight like the males.
Swordfish often fight each other for the right to mate with females or for territory. These fish are very large and very territorial and will often even fight with humans who enter their area.
Yes it is bad because they will fight but if they have grown up together they wont fight.
easily.. when breeding, fighting for territory.. or if they are aggressive :D you will have to do research to determine what fish are compatible with what.. and individual fish may vary too.. Is your cichlid real calm and passive? then dont put him in with an aggressive fish.. just pick out what fish you want and call your LFS (local fish store) for help.
They are instinctively fighting over territory and breeding rights, only one male will dominate.