with the little information you gave it is not clear what size tank, equipement, how long cycling, or parameters. if you have been cycling for less than 3 months you probably added to much too soon. the angel is by far the more sensitive of the three so do not add any more fish, start testing for nitrate, nitrite, and amonia. do not add anything until the amonia and nitrites are at 0 and water change to control the nitrates which will rise after the cycle has complete. each new live addittion will require the system to increase the bacteria population to cope with higher bio loads hence tank will again cycle to some extent. so go slow, test, and i would recommend a good book at this point that covers the new salt water system set up and cycle process in general. hope something here helps but you will or probably have lost your angel. let us know if you have further questions and keep us posted on your progress. welcome to the forum.