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Old 06-13-2009, 09:24 PM   #1
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Reading or advice on how to plumb 125g drilled tank / sump / skimmer

I just bought a used 125g aquarium, stand and canopy. It's 72in x 18in x 20in. It is a glass tank with one return and one flow on each end. It has a 40g acrylic sump, protein skimmer/pump and Little giant 850gph return pump. Also has 1 UV 12a with it.

I need help on understanding how I should plumb this.... Especially the sump area... the sump is 30in x 11 1/4in x 16in but only has one separating compartment that doesn't go down all the way.

Anyone have any good reading for this? I tried Melvs and google searches but nothing really shows good pictures.... is this something maybe I should draw / take pictures of and post on here?

I have about 1yr reef experience but it's with a 34gal all-in-one nano that I really didn't have to plumb at all.

Thanks for the help!
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Old 06-13-2009, 09:35 PM   #2
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Old 06-14-2009, 07:30 PM   #3
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You can check out my build thread. You might get some ideas.
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Old 06-14-2009, 07:41 PM   #4
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I have and your thread is awesome! Thanks. So i know understand how I need to plumb but have some questions on the size of pipe.... currently each corners "return to tank" PVC is plumbed with 3/4'' and then when it exits the tank it is downsized to 1/2'' (which goes to the 850gph little giant)....... Then on both sides the "overflow to sump" PVC is plumbed in tank at 1'' and then when it exits tank it is downsized to 3/4'' and both ends drop in sump. My question is - is this sizing correct? Why didn't the return stay at 3/4'' all the way and the overflow stay at 1''?

I plan on using the tank as mostly fish and LR but I will definitely have quite a few coral...
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Old 06-14-2009, 07:50 PM   #5
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correction.... the overflow to sump PVC is 1 1/4'' and then downsized to 3/4''.
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Old 06-14-2009, 08:40 PM   #6
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Where does the drain downsize? At the bulkead? You really don't want anything smaller than a 1" drain. The return is OK at 3/4".
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Old 06-14-2009, 08:48 PM   #7
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Yeah they are all downsized right after they transition through the glass - after the bulkheads. Wonder why it was set up that way?? It's no biggie for me to take out their adaptors and move the drain to a full 1''.

but the drain isn't at 3/4... it also transitioned to 1/2 after the bulkhead -- but it's also easy for me to change that back to 3/4.

any idea why the original owner would have downsized both drian and return?
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Old 06-14-2009, 08:49 PM   #8
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I goofed a couple times so just to re-iterated
Return is 3/4 in tank and transitioned to 1/2 after bulkheaded through bottom of tank
Drain is 1in and then transitioned to 3/4 after bulkheaded through bottom of tank.
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Old 06-14-2009, 09:07 PM   #9
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IMO you want to keep your drains at 1".

I like going with 1" for return lines as well. Any smaller and you really start noticing the head losses due to the friction in the pipe.
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Old 06-14-2009, 09:16 PM   #10
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I have a little giant 850gph pump and the output on that is 1/2in so maybe that's why they kept it that way..... so if If I bulkhead it from 1/2 to 3/4 (or 1in) straight from the pump - will that affect anything negatively?
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