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In my 120 with dual overflows I had the 2-1" lines running siphon running into a 1.5" TEE, and below that I had a 1.5" gate valve . I had a heck of a time all the time balancing the two weirs, because my plumbing underneath wasn't equal
On my 180 , I just plumbed it with the 1.5" return line over the back, and the
2-1" siphon lines in each weir are independent , each with its own gate valve
Been working perfect ! I'm very happy I went this way, just worked great
My other drains lines in each weir, and DRY emergency only
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RedSea Reefer 350 ,Apex Controller ,2x Hydra 26HD lights
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Reef Octopus VarioS return pump , UV sterilizer
Ice Cap 3K Gyre - Started up 8/13/19
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