Will the other fish be ok?

I have 2 mollies that are used to aquarium water with 1 tablespoon of aquarium salt in there 10 gallon aquarium. I want to move them to the 20 gallon but there is a pleco, a goldfish, 2 ghost shrimp, a blue gourami, a tetra, and 2 betas. will they be ok with aquarium salt in there? If so should i add 2 tablespoons of aquarium salt to it since it's a 20 gallon?