Here's a question from a newby

In my tank (a jewel rekord 110) i've got an ill Hyphessobrycon erythrostigma (i dont know the english name) which i want to treat whit seasalt (it has been ill before and it worked great), but i don't want to put the poor fellow in a seperate tank (other fish are healthy).
So my question is can i put seasalt in to the aquarium which has 5 corydoras melanistis inside it, i've read somewhere that they are very sensitive to seasalt.
If yes what is the amount of seasalt i can put in to my tank (110 liters) whitout harming my corydoras