As far as Tangs go it really depends on how big you get them from the start and their personality. I love the Yellow tangs, Purple Tangs, Powder Blues or the Powder Browns, In a 135 I would stay away from the Hippo tangs and the Sailfins, they get big fast. Powder blues can get very aggrssive but if they are all added at the same time you should be ok. Make sure you have lots of rock for them to hide in. I would be really hesitant on a Copperband Butterfly, most don't make it. 3-4 small tangs in your tank would be more than enough imo.
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