HCA: Hermit Crab Association

So since this is what I have (API Aquarium Salt) it says to put a rounded teaspoon in a gallon of water. But since I'm using it for the crabs drinking water, how much should I use in a gallon?

One rounded teaspoon is not going to be enough you need to do eight tablespoons to one gallon of water to get the correct ratio.If you mix to the instructions on the back of the box the water will be to diluted for the hermitcrabs to make much use out of.