You need to research this decision a little more thoroughly. 1) Your angel fish originates from a habitat that is very soft watered, very acidic. That said, many angel fish are bred in harder waters than they developed in, nevertheless, their natural habitat is essentially completely free of all minerals, including salt, so they could be very intolerant. There are a few species that are brackish and need salt, but none of those in your sig. 2) What precisely are you trying to accomplish using salt? Are you fighting a specific disease? Trying to use it as a magic preventative tonic? It is my opinion that the benefits of salt can be very highly overstated. It can be used to treat a few diseases, but in terms of preventative measures, doing your water changes and tank maintenance are far, far more important.