I don't think that the two salt are bad if for Marine fish only but it does not give you the other mineral that other salt have from what I read, search and understand. Try to search online the other different salt and compare it the two salt that you mention and see what you like and don't like about. Please correct me if I'm wrong. I personally use the Kent Marine or ReefCrysal salt. Those two type of salt gives you a better cal., free pho and nitrate, gives you better trace mineral that found in the water when you mix it in IMO.