Tangs of different body shapes usually get along OK, its when they have the same body shape they do battle for me. I would'nt put two in a tank any smaller than 90 of so gallons though, they need room to swim and grow. Alwasy stock a tank based on the fishes adult size not how big they are today, your goal is to keep them their entire life so make sure you have the room. I have had several tangs including a hippo and sailfin live past 13 years and many past 7 years.
I have a love for tangs.
I have a 150 gallon reef with a kole tang, yellow tang, sailfin tang, blue hippo tang, and a powder blue tang.
They do on occasion get into each others way and start sword fighting with their barbs but this is only once in a full moon. 99% of the time they are great with each other. However keep in mind just because 1 person has a good experience doesn't mean it will be good for you. Always use caution when introducing new tank mates.
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