I just worry about the valentini because it is a slow small fish and I worry that a large fast fish like a large dragon wrasse might freak it out or directly harass it. A freaked out puffer can release some nasty toxins. Chances are that it would be fine, but it's not a risk i would take personally.
I would not keep both of those wrasses in a 125g. at least 200g imo. I suggest sticking with the dragon if you're okay with its... boisterous personality. personally I like the lunare a lot more.
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