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Unread 11/20/2005, 05:49 PM   #79
Superorb
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Join Date: Jun 2005
Location: Denver, CO
Posts: 430
i've got 3 holes in the back of my tank for a closed loop. two for 3/4" bulkheads and one for a 1" bh. plus the usual 2 in the bottom for the overflow. i think they need to be like a radius of like a few inches to be on the safe side. i don't recall the exact amount, just dont stick them close together is all.


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