For the aquarium salt it is one tblspoon per gallon, but for table salt and iodine free salt i am unsure of the amounts...
As for my avatar... it is not my dojo loach in the picture, it is from website, i should get my dojo on avatar, he likes to hang from plants in tank like a lazy boy reliner...lol. I have two dojo loaches in tropical community tank, don't do that cold water just for them, i am sure i would piss off a loach lover fanatic, but my two dojo seem to be the most active and happy of all my fish.