Best salt (or most salt I see ppl saying) is proper aquarium sea salt, otherwise things like sea salt rock salt etc should be fine, basically pure salt is what your after, no anti-clumping agent as this is sometimes cyanide (ok for us in small amounts not for fish), amounts can never remember sorry, google or someone else here should know.
I put the GT if you havn't allready (and yes JD's can be wuss's LOL, cichlids are fish of their own personality)
KW