What size overflow for 40B?

iwishtofish · 10/16/2009, 09:54 AM

I'm leaning towards ordering an overflow kit from glass-holes.com, and would love some input on what size to get for my 40 breeder (maybe 700gph?)

I love the idea of the small footprint of their overflows, but I'm wondering if that small footprint would provide enough surface skimming?

shroutk3 · 10/16/2009, 10:37 AM

That's what I have on mine. My pump runs around 600gph and I wouldn't have done anything differently

iwishtofish · 10/16/2009, 11:05 AM

Thanks, shroutk3 - good surface skimming?

WI reefer55 · 10/16/2009, 11:29 AM

700 is more than enough.

but i would not go any small. its nice to have extra room in case u top off from your display tank or u stick you hand in there etc..

iwishtofish · 10/16/2009, 11:32 AM

Quote:

Originally Posted by WI reefer55

700 is more than enough.

but i would not go any small. its nice to have extra room in case u top off from your display tank or u stick you hand in there etc..

Sounds like good advice, WI reefer55! Thank you!

Anyone else have any opinions about the surface-skimming issue?

username in use · 10/16/2009, 12:20 PM

I have a 700gph HOB overflow with about the same footprnt as the glass holes, and it skims the surface perfectly I run a mag 5 return pump with about 4ft of head.

SkyPapa · 10/16/2009, 12:31 PM

I agree the 700 is enough. I have overkilled my 40b with the dual 1.5 inch outlet 1500gph glass-holes kit.
I run it now with a gen-x-30 with a lot of head loss, so the overflow is running less than 1/2 capacity but I have lots of surface skimming.

iwishtofish · 10/16/2009, 08:09 PM

Quote:

Originally Posted by username in use

I have a 700gph HOB overflow with about the same footprnt as the glass holes, and it skims the surface perfectly I run a mag 5 return pump with about 4ft of head.

Sounds great!

Thank you!

Quote:

Originally Posted by SkyPapa

I agree the 700 is enough. I have overkilled my 40b with the dual 1.5 inch outlet 1500gph glass-holes kit.
I run it now with a gen-x-30 with a lot of head loss, so the overflow is running less than 1/2 capacity but I have lots of surface skimming.

Thanks, SkyPapa. I feel confident now about the surface skimming and flow rate!

SpencerG · 10/16/2009, 08:53 PM

I bet that will be more than enough. I have a 300 gph eshopps box, and it does a fine job of turning over the water and keeping the surface pristine.

iwishtofish · 10/16/2009, 09:34 PM

Quote:

Originally Posted by SpencerG

I bet that will be more than enough. I have a 300 gph eshopps box, and it does a fine job of turning over the water and keeping the surface pristine.

Thank you, SpencerG.

10/16/2009, 09:54 AM	#1
iwishtofish Registered Member Join Date: Apr 2007 Location: Southern Maryland Posts: 4,949	What size overflow for 40B? I'm leaning towards ordering an overflow kit from glass-holes.com, and would love some input on what size to get for my 40 breeder (maybe 700gph?) I love the idea of the small footprint of their overflows, but I'm wondering if that small footprint would provide enough surface skimming?

10/16/2009, 12:20 PM	#6
username in use Sciencing Daily Join Date: Mar 2009 Posts: 6,560	I have a 700gph HOB overflow with about the same footprnt as the glass holes, and it skims the surface perfectly I run a mag 5 return pump with about 4ft of head. __________________ Joshua "With fronds like these, who needs anemones?" - Albert Einstein Current Tank Info: multiple nano's sprinkled around the house

10/16/2009, 10:37 AM	#2
shroutk3 Registered Member Join Date: Mar 2009 Location: Ripley, Ny Posts: 315	That's what I have on mine. My pump runs around 600gph and I wouldn't have done anything differently

10/16/2009, 11:05 AM	#3
iwishtofish Registered Member Join Date: Apr 2007 Location: Southern Maryland Posts: 4,949	Thanks, shroutk3 - good surface skimming?

10/16/2009, 11:29 AM	#4
WI reefer55 Registered Member Join Date: Dec 2008 Location: Milwaukee, WI Posts: 294	700 is more than enough. but i would not go any small. its nice to have extra room in case u top off from your display tank or u stick you hand in there etc..

10/16/2009, 12:31 PM	#7
SkyPapa Premium Member Join Date: Aug 2007 Location: Central Florida Posts: 994	I agree the 700 is enough. I have overkilled my 40b with the dual 1.5 inch outlet 1500gph glass-holes kit. I run it now with a gen-x-30 with a lot of head loss, so the overflow is running less than 1/2 capacity but I have lots of surface skimming.

10/16/2009, 08:53 PM	#9
SpencerG Registered Member Join Date: Oct 2007 Location: New Orleans Posts: 356	I bet that will be more than enough. I have a 300 gph eshopps box, and it does a fine job of turning over the water and keeping the surface pristine.