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Old 03-03-2009, 04:53 PM   #11
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Do you think I need to drill for the return line or lines? i was thinking of 2 drain lines. One in each upper back corner. Is there an advantage to having a drilled return? This is all new to me. I think four holes might be pushing my luck. Could i have 2 drains and one return hole?

Or am I better off with one drain and one return line?

So If I want to run around 500 gph...with 2 drain holes. You say a one inch hole is going to get 600 gph. Would I want smaller than one inch holes than? Wouldnt 2 one inch holes get 1200 gph?

Same as the overflow box capacitites. Two 300gph versus one 600gph??

Thanks again.
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Old 03-03-2009, 05:00 PM   #12
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Me. I'd do 1 @600. Are you drilling the back or the bottom? Mine are drilled on the bottom.

Yes, you can have 2 drains and 1 return. Regardless of the amount, they will drain to and return from the same location.

I like single corner (near corner) drains. It give you that circular flow
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Old 03-03-2009, 05:07 PM   #13
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I will be drilling the back. At least one corner for a drain. With one drain, I would have the return in that same corner?

Would it be better to have the return on the opposite corner? I may be fundamentally missing something here as to how the boxes are set up. Is the return there to hide it also??

It sure would be cheaper to drill just one drain line. One less overflow box and all the fittings will add up. 2 drains might be redundant because I will be getting around 600 gph regardless. Less to see in the aquarium also.

This is so helpful!!
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Old 03-03-2009, 05:17 PM   #14
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1 box, 2 holes. 1 for the drain, 1 for the return. The piping for the return comes up and then over the drain box. That's how both of mine are plumbed. All hidden in one box.
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Old 03-03-2009, 05:35 PM   #15
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Now depending on where the holes are, does this dictate what the actual overflow box looks like?

For example..if the tank is drilled through the bottom the overflow box has to go all the way to the bottom of the aquarium correct? If my holes were closer to the top could I get anyway with a smaller box? It sometimes seems as though the corner boxes take up a fair amount of space.

I just think smaller boxes look better. It seems as though most predrilled tanks with overflow boxes go all the way to the bottom.

Does a tank have to be notched for an external overflow box?
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Old 03-03-2009, 05:38 PM   #16
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They go all the way to the bottom because they are slotted all the way to the bottom. This allows it to draw water from the top middle and bottom of the tank instead of just getting the surface.

To be honest I'm not sure if you can buy half-height/quarter height boxes. If that's your preference maybe the HOB overflow is the better choice?
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Old 03-03-2009, 05:50 PM   #17
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The slotting brings in together for me. Now it makes sense why the boxes go all the way down. So the hang on back versions will only draw off the top primarily. To be honest I want the safest way. I really want to avoid any flooding disaster if possible and perhaps the more in tank equipment the better. Sounds like the internal would probably do a little better job while being safer. And less stuff behind the tank.

Where would you drill the holes if it were your tank? If I am going with internal. I can drill where ever. What is optimal for one drain and one return? I always think that the lower the hole the more potential for disaster. I like that idea of even of the holes being higher up in case the holes were to leak or something that it could only drain the tank that far down.Lol. Im kind of paranoid after having a 150 gallon crack on me. What a nightmare.

Thanks again Captain. Incredible help.
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Old 03-03-2009, 05:57 PM   #18
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The tank is only going to drain as low as the top of the overflow box. What I neglected to point out is that even though the box is slotted, those slots are channeled upward, so the water enters the lower slots and then travels upward in an internal chamber and overflows into the main chamber (if that makes sense). In that way, unless the entire box structure or seal fails the exposure limit is the water level up to the top of the box. If your sump is designed right then your covered. You don't have to worry about siphon breaks and pumping your sump back into the tank and over the edge.

As with anything, there is always a chance.....
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Old 03-03-2009, 06:11 PM   #19
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Makes so much sense. I didn't know that the overflow boxes had like a baffles set up within. It's all coming together. I guess it's not really too critical where the holes are.

It probably depends more on the plans for the sump setup and all the piping to go along with that. I was going to go with the return in the middle of the sump setup when I was thinking about having 2 drain holes. Now I will just run a standard sump with the water flowing from one side to the other where the return will sit.

Is this a typical sump?

Skimmer/refug/return area.

Should I have the skimmer sitting in the first main area in the sump? On the side under the drilled holes? I guess the less piping the better?
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Old 03-03-2009, 06:37 PM   #20
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R-L (for me) , Skimmer, LR/LS/Macro/etc, Return is my setup. Piping is 6 of one, half of another. I prefer my return to be the short end and I'm drilled on the left
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