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#1
11-06-2012, 05:18 AM
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Whatever internal to the overflow will likely be just a simple one. The box it's self will be an almost coast to coast internal so by going out the back I loose very little internal space. So would that be the best way or should I do it that the overflow is shaped like a "T" so the water would flow to the center and then go into the return plumbing.
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#2
11-17-2012, 12:23 AM
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Drilling through the back can lead to a stress crack if the weight of the plumbing hangs off the bulkhead. Had it happen to me on a 46 bowfront once. Not pretty. If you do go through the back make sure you support the piping with blocks and hangers so there's no load on the bulkhead.
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#3
11-17-2012, 02:37 AM
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Turned my 220g into a salt tank with 2 internal overflow boxes, each one is 24" long x 6"x 6" and I have them up in the corners. I drilled 3" holes for each box for the bulk heads and 2" pipe goes down to the sump. Over flows work great. If I had my choice I would have external overflows to give the tank a real clean look.
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#4
11-17-2012, 02:59 AM
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I drilled 2 holes in the back at the top of my 90 g and used an internal 1200 gph overflow.
Bought it from BRS 12"x6"x6" and installed it as per their instruction video, going do the 1" herbie drain with a redundent emergency 1" drain. Return from the sump will be back into the tank over the rim.
__________________
Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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#5
11-17-2012, 04:42 AM
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i will take the advice of the supports for the plumbing I've opted for 2 of the brs 2400gph overflows in addition to the existing over flow. the brs ones will have a 11/2" "t" oriented vertically with a cap on the upper end with a hole drilled in it similar to a durso stand pipe which i have on the 175g and is dead silent. the existing over flow will be a 2" durso more-so meant as a emergency drain. not exactly looking forward to drilling the holes but gotta do what you gotta do.
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#6
11-17-2012, 04:57 AM
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How much flow are you trying get out of that sucker? If you put all that though your sump you gonna have raging waterfalls in there! Lol. Is the new overflows to feed a closed loop? If so you don't need an overflow, just a submerged bulkhead with a strainer to keep critters out.
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#7
11-17-2012, 06:12 AM
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it will be 2400 gph of sump flow. i know i have far more than that in flow overflow capacities but dad wants to have it capable of increased flow plus i might start to mess around with a wave in there. for dual drains alone at 2400 total flow i need 2 x 1 3/4" drains as my primary then as per the plan the exiting will take any excess flow and act as an emergency. all will have valves to throttle independently if its necessary to do so. between all three i will have the drainage for about 4000gph although i should never meet that ammount
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