My take... put one ball in the left where the overflow keeps it tumbling, as long as it is properly lit..and put another in the fuge area...and see who 'wins'. Instant contolled experiment 
D
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
