They can't.
You do not have to remove fish to clean a tank, as you should never be cleaning the entire tank; it will remove the good bacteria needed for the health of your fish.
If your tank is over stocked and you are unable to upgrade to something bigger, many local fish stores may be willing to give you store credit for returning some fish.
yes
yes but only a betta fish and moutain minnows can live in a bowl :) oh and they cant live together
There are millions of tropical fish in the tropical oceans. But they are all marine fish not freshwater fish. Freshwater tropicals can not live in saltwater.
No. Tropical Fish required warmer water.
Although it may well be possible to keep one for a short time (1"of fish NEEDS 1 gal of water)I believe it is cruel to keep any fish in a 'fish bowl'. Even a Betta.
Most tropical fish live in the ocean, but some do live in freshwater.
A guppie is a tropical fish and should be kept in an aquarium with other tropical fish, a goldfish is kept in a bowl or tank in cold water - the 2 cannot be kept together because of the different in the temperature of the water
No! because tropical fish live in heated water and koi in cold water.
Yes they can live in a fish bowl but they will eventually take over the bowl.
Tropical fish.
parrot fish live in tropical waters
Those are salt-water tropical fish not the freshwater fish you see in pet-stores.