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Honestly I've run open-top for over a decade, and the only time I ever had jumpers was in my first years of reefing. And I stopped having jumpers after I eliminated sources of aggression and introduced moonlight so the tank was never in "pitch black" darkness.
That said I do keep a lid on the tank of my 6-line i got a month ago, as a precaution, though i've yet to see any jumping tendencies from him.
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