I have got 4 mollies(2 black 2 orange),2 angel fish , and 2 other yellow fish. do I need to input some salt ?

Question

yellow fish are having one spot just before their tail plz tell me the name of that fish with source of site is the salt necessary

Answer 1

Mollies tend to be more healthy in an aquairium that adds salt, Angels would love it too. Your yellow fish ( hopefully its not an amozon cichlid) I don't know what to tell you about them, include a pic so people can see what exactly your talkning about. Look into the breeds of your fish for compatibility, Angels and Mollies should get along..but those yellow ones....

Answer 2

I raised Mollies and AngelFish and never added salt.  I don't know what your yellow fish are.  You might want to find out if they are salt-water fish from a knowledgeable pet store.  If they are....separate the fish.