single vs dual overflow for 125G

Rekonn · 05/31/2010, 09:39 PM

I'm planning a new system, will probably be a 72x18x22 125G. The return pump is only going to do ~4x display volume, and additional flow will be supplied by powerheads. Is there any reason to go with dual overflows in this scenario, or will one be fine? It seems very common to have dual overflows for tanks this size and larger.

Rekonn · 06/01/2010, 09:45 PM

bump

ronsonol · 06/01/2010, 10:18 PM

I bought my 125G, and it already came with dual overflows. With 1.5 inch drains, and 1 inch returns. I also run close to 4x turnover.

I run a mag 9.5, and one overflow is enough for this pump, but I use both of course. The 1.5 inch drain's are overkill for my turnover.

In retrospect I would have perfered one overflow, but with two drains, and 1 return. The boxes themselves take up plenty of room.

jubjub · 06/01/2010, 10:28 PM

i have a 90gal with a single 1"overflow i have a mag 9.5 throttled down about 50% or so.... i wish i had dual overflows or atleast a bigger drain.. like 1.5"

Rekonn · 06/01/2010, 11:03 PM

Quote:

Originally Posted by jubjub

i have a 90gal with a single 1"overflow i have a mag 9.5 throttled down about 50% or so.... i wish i had dual overflows or atleast a bigger drain.. like 1.5"

I'm guessing you're using a durso or something else that has air going down the drain. If you switch to a herbie setup you won't have to throttle the mag down so much. A full siphon drain can handle a lot more gph.

Rekonn · 06/01/2010, 11:11 PM

Quote:

Originally Posted by ronsonol

I bought my 125G, and it already came with dual overflows. With 1.5 inch drains, and 1 inch returns. I also run close to 4x turnover.

I run a mag 9.5, and one overflow is enough for this pump, but I use both of course. The 1.5 inch drain's are overkill for my turnover.

In retrospect I would have perfered one overflow, but with two drains, and 1 return. The boxes themselves take up plenty of room.

Yup, the boxes do take up a lot of room. I'd like to set up a gyre for flow, and one corner overflow would be best for this. I've been looking at the Aqueon site and I don't see any single overflow big tanks though.

billdogg · 06/02/2010, 06:13 AM

IME, 2 drains is always better than 1, even if #2 stays unused in the same overflow - Murphy is alive and well and lives in YOUR aquarium, just waiting for a chance to flood your house!!!!

Reef 101 · 06/02/2010, 06:30 AM

i need to now also im getting ready to drill my 125

Rekonn · 06/02/2010, 08:27 AM

Quote:

Originally Posted by billdogg

IME, 2 drains is always better than 1, even if #2 stays unused in the same overflow - Murphy is alive and well and lives in YOUR aquarium, just waiting for a chance to flood your house!!!!

The Herbie style setup already has a dry backup drain just in case. So, in my case, there's no need to have a second overflow box in the tank just for backup.

05/31/2010, 09:39 PM	#1
Rekonn Premium Member Join Date: Dec 2005 Location: San Francisco CA Posts: 769	single vs dual overflow for 125G I'm planning a new system, will probably be a 72x18x22 125G. The return pump is only going to do ~4x display volume, and additional flow will be supplied by powerheads. Is there any reason to go with dual overflows in this scenario, or will one be fine? It seems very common to have dual overflows for tanks this size and larger.

06/01/2010, 10:28 PM	#4
jubjub Registered Member Join Date: Jul 2007 Location: vacaville, cali Posts: 2,698	i have a 90gal with a single 1"overflow i have a mag 9.5 throttled down about 50% or so.... i wish i had dual overflows or atleast a bigger drain.. like 1.5" __________________ "The world holds two classes of men - intelligent men without religion, and religious men without intelligence." - Abu Ala Al-Maari

06/02/2010, 06:13 AM	#7
billdogg Registered Member Join Date: Apr 2008 Location: Grove City, Ohio Posts: 10,806	IME, 2 drains is always better than 1, even if #2 stays unused in the same overflow - Murphy is alive and well and lives in YOUR aquarium, just waiting for a chance to flood your house!!!! __________________ I'll try to be nice if you try to be smarter! I can't help that I grow older, but you can't make me grow up! Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer

06/02/2010, 06:30 AM	#8
Reef 101 Registered Member Join Date: Mar 2010 Location: Ft,Myers, FL Posts: 74	i need to now also im getting ready to drill my 125 __________________ Life is fast so drive a faster car! Current Tank Info: 180 gal reef mixed

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06/01/2010, 09:45 PM	#2
Rekonn Premium Member Join Date: Dec 2005 Location: San Francisco CA Posts: 769	bump

06/01/2010, 10:18 PM	#3
ronsonol Registered Member Join Date: May 2010 Location: Kingston, ON Posts: 109	I bought my 125G, and it already came with dual overflows. With 1.5 inch drains, and 1 inch returns. I also run close to 4x turnover. I run a mag 9.5, and one overflow is enough for this pump, but I use both of course. The 1.5 inch drain's are overkill for my turnover. In retrospect I would have perfered one overflow, but with two drains, and 1 return. The boxes themselves take up plenty of room.