U buy tropical fish and get a background and then that is how u can do that
Use a tropical fish tank, preferably new. That way you know that it should not leak. Try to avoid using a tank that was used for something other than tropical fish. I prefer glass tanks over acrylic because they are less likely to mark or look dirty and they are easier to keep clean. Most aquarists will tell you to start off with a small tank and as you enjoy it more and more, you can opt a larger tank. When I started into tropical fish and as I bought larger tanks I used the smaller tank for breeding. Tropical fish tanks and supplies are available in most pet stores that sell tropical fish.
no tropical fish need warm water
No. Not in the traditional definition of the tropical tank. A tropical tank is a freshwater aquarium. Regal Tangs are saltwater fish and go in a saltwater tank (marine aquarium).
why not
Probably the fish. I would not put a crab in a tank with tropical fish unless they were a LOT bigger than it was, and it was not going to grow any larger.
if you have a tropical fish or a filtered tank than yes you do need a light
Only if it has a heater in the tank other wise the tropical fish will die. They are warm blooded instead of cold blooded.
because they will be unhappy and start to have bad behavior and nip at your other fish (if you have more than one in your tank)
Usually there is a heater that warms the tank on purpose.
small ones
nothing!
yes