nitrite is WAAAY too high! your fish will be damaged, if they aren't already. it is okay to do more than one water change a day, as many as needed to bring nitrites down below .25. only then are your fish safe from gill damage.
salt is unnecessary. what is your reasoning for adding it? as i already said, aquarium salt in freshwater DOES NOT make it brackish. only marine salts make freshwater into brackish water.
in another thread you said you felt you were overstocked with 4 mollies in your 10g why add more fish? ghost cats are not brackish water fish, so no, they will not be happy in it.