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#1
03-02-2017, 12:03 AM
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I have three 90s and two 45s on my overflow drains which is setup Herbie style. No problems here. My gate valve is also right below the overflow box, this way I'm able to tweak the flow every once and a while and watch the water level at the same time. Also, adjustments have an immediate effect.
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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 
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#2
03-02-2017, 12:23 AM
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90s are ok going down to the sump. 45s are far better for maintaining flow and reducing head loss for returning water to display.
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Hybrid Mode
