What are the other fish and quantities on the list? multiple tangs should be at least 3 or over. Your tank size certainly can house about 3-4 tangs, depending on the species and the size you want to get. However water quality always comes first when dealing with tangs.
Just to answer your question, yes yellow and purple can co-exist, provided yellow is slightly larger, and yellow is in first. Purple should go in the last and preferably small. We need to know your tank setup, wanted fish list, and equipments, to offer you the order the fishes should go in.
Just to answer your question, yes yellow and purple can co-exist, provided yellow is slightly larger, and yellow is in first. Purple should go in the last and preferably small. We need to know your tank setup, wanted fish list, and equipments, to offer you the order the fishes should go in.