They want to play with each other or they are bored and hungry. The third reason is bullying, leave the fish that bully's in a seprate tank for a while until it stops.
Some fish (for example guppies) have long wavy fins, some other fish such as mollys like to nip at these fins, if your fish are doing this then it would probably be best to buy another tank and separate them.
Scoop all your fishes to another tank or tub of water and clean the fish tank just as you would normally without the fish
Aquarium is another name for a fish tank
Aquarium is another name for a fish tank
You don't buy the fish. Unless, of course, you have another tank that is ready.
A fish can disappear from a tank if it jumps out, is eaten by another fish, or if it dies and decomposes quickly.
the fish tank
Yes, it is possible for a guppy's tail to be bitten off by another fish in the tank.
Not unless you had another fish in there.
A betta fish? You can't or they will kill the tank partner
The fish disappeared from the tank overnight because they may have been eaten by another fish, jumped out of the tank, or died due to poor water conditions.
fish tank