yes
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
With great difficulty.
The only fish you can keep in a 5 gallon tank is one betta (Siamese fighting fish) on it's own as that is a very small tank.
an aquarium or a fish tank
If you have a heater, turn it off.