Little guy in the big tank!

I've separated my tank and have two Dats growing out on one side and 10"+ Dat et al on the other. This guy somehow got across (they've been separated since October). I've seen the beast snatch a fish twice the size of the little Dat without even burping but he doesn't seem to be interested in the smaller Dat at all. I've separated them again before leaving the room but do I need to? Any of you have luck mixing 2-3" dats with much larger ones?

Cool - his color isn't stable yet but when he was in with the bigs guys, he seemed to light up. I'm gonna try taking out the egg crate.


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Ok - I think we're good. 36 hours and both little guys are still there. The big guy doesn't seem to notice - I haven't seen him stalk or take a predatory posture at all. As a matter of fact he seems almost a bit nervous of the little guys darting around. They get chased a bit by a big mono and by a large scat but nothing that can swallow them whole. And when I feed, they are right in the middle trying to get the massivore.