#6
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For greater depth penetration. I've seen T5s over a 36" deep tank and they don't do a very good job of illuminating the bottom.
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour |