Exactly, I never add anything to my tank unless its necessary. To the OP, I prob wouldnt anything, but if you feel the need to, half dose it.you will not make your discus happier with salt. I use a little when one of my wilds scratches itself on the wood, and only for a couple of days. salt in a healthy tank is another old myth. imo, you should never add anything unless there is a specific need. it seems like adding salt is going to make YOU more comfortable. save your money. your fish will thank you.