they see a reflection of themselves in the glass and think it is another fish
If there are other fish in the tank, then it could be because the other fish are biting that one. i suggest u keep the fish in separate tanks.
put them in a separate tank
If the tank is large enough place a separator in the tank if not move them apart. 1 fish one tank.
yes
Yes, if you separate them for 1 week in a tank with a clear divider.
IN WATER!!!! (TANK!!)
it cleans the tank and keep the fish heathy
There are a variety of fish that can keep a tank clean. The type of fish will depend on the type of aquarium setup. In a freshwater tank, different types of plecostomus are most common.
fish tank
Not unless you had another fish in there.
fish tank
about 85F