As you know flame angel is still a kind of dwarf angel and some dwarf angel are known to nip on lps or coral polyp............. As i always say, different angel has different character just depend on whether you dare to take the risk........ Some people experience havoc created by their flame angel when they add it to their tank but others had flame angel with totally no problem..... BTW tang are big fish and rather fast swimmer, love to lap around the tank, so a big tank is needed to give them ample room...... A blue tang can grow up to 25 cm therefore need at least a 4 feet tank IMO, while a yellow tang remain smaller so maybe a smaller atnk can be used to keep them.............. BTW some atng are territorial and aggressive so read up more on tang compatibilty