I have been keeping three urchins for the past three years and the trigger doesn't even look at them. I have a four year old and a one year old Linckia starfish and he removes them if they step on the clear sand patches in the front of the tank. I have no other inverts as my large Red Coris ate them all a few years ago.And I assume you don't have much in the way of inverts? I noticed an urchin in the video, and know that they will get into urchins in the wild but maybe not in a tank if well fed.
Huma Triggers might be my fave fish and I really miss keeping them in my early days. Your tank has me thinking about them again. Doesn't take much to tempt me
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