How do I raise the KH and GH in my shell dweller tank?

Did you you check th kH and gH after adding the Baking soda? I am 95% sure that Baking soda actually raises the pH because it raises the kH. I am not sure how to raise the gH. I think salts like Epsom also raise hardness, but I'll defer to another person to confirm that. . .
 
Just get a clean plastic bucket or something.
Mix all the ingredients you need to add, in a half or one gallon of water. Pour this mixture gradually into your tank within the same time you add new fresh water.

I always use an old goldfish-bowl.
With the bowl placed on top of the tank and a piece of hose, the one used for air pumps, I slowly add the mixture to the tank.
Works great for me.

Jimmy
 
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