Zebra Danios can handle a small amount of salt in their water but it is not a smart thing to have in your fresh water tank. The reason for this is, salt can be used as a medication for some fish ailments. If there is salt already in the water, in order to dose the fish you will have to put in a measured/correct amount of salt thereby overdosing the tank and maybe killing the fish.
Most fish can tolerate aquarium salt to a greater or lesser degree/concentration. There are however some fish that do not do well with any kind of impurity in their water eg Discus.
Aquarium salt is manufactured for different reasons than making your aquarium the perfect environment for salt water fishes. You may use it in an emergency, but long term is harmful to your fish. Marine salts contain the necessary salts and minerals that fish need are the best salt to use.
Whether or not you should even think of using salt in an aquarium is dependent on the type of fish you keep in it. guppies, for example, do well with the manufacturer recommended dose of aquarium salt. Gold fish, on the other hand, need little or no aquarium salt. while appropriate salt levels will encourage good health, aquarium salt shouldn't necessarily be used to treat fish diseases. it might help, but that depends entirely on the problem. Also, the right type of salt to use depends on your aquarium. a marine aquarium requires special salt and readings on the specific gravity of the water. freshwater and brackish fish are more likely to require simple aquarium salt. Either way, we aren't talking about table salt here. go to the pet store and get something designed to be healthy for your aquatic pets.
Regular salt may contain anticaking agents nuisible for fish.
A salt water aquarium requires a number of supplies to keep the fish happy and healthy. Some of the required supplies are the aquarium tank, a filtration system, a light fixture, a heater, sand or rocks for the bottom, and whatever rocks and other decorations one wants. One would also need fish for their aquarium. Some popular fish for salt water aquariums are clownfish, chromis and cardinalfish.
This salt may contain another additives as anticaking agents nuisible for fish.
The ability to survive or tolerate a quantity of salt in the water in which the fish live. More salt tolerance can cope with more salt in the water and vice-versa.
You should ask this question in the 'salt water' section.
There are many species of saltwater fish. To see a variety someone can go to the local fish store or aquarium.
Aquarium salt, not sea salt. Make sure it is freshwater salt, not marine salt or iodized. Salt in fresh water tanks can reduce stress and help in healing. Many types of fish including the live bearers and gold fish greatly benefit from it , helping to promote reproducing.
No fish I know of can live in Aquarium salt. All fish need water to live in. If you are asking if a tiger barb (Barbus tetrazona) can live if it was placed in a marine (salt water) situation, then the answer is "No. Not for more than the few minutes it would take for it to die.
Probably because theres no salt.
This link lists the most common fresh water aquarium fish (excludes salt water fish), there are hundreds.