I can't find Zonatus anywhere near me. That one's rare to me I've only seen them on MFK. I'm a huge fan of all the vieja's but that one has the most blue I think. Probably a bad call temperament wise though. Any fish you add will probably be a gamble they might find a way to slip into your tanks hierarchy -they might not. Chaos will probably ensue initially regardless of the outcome. You have a big tank in my opinion- but medium sized fish have different opinions on what's "big" to them. When their real estate shrinks aggression might grow