hi guy's i want to know if one of you have a used overflow box for a 125 gallon fish thank one like 1200gph or 1000gph

There are many HOB overflow boxes out on the market today. In my opinion they are overpriced and you can make one yourself for a fraction of the cost. If you are looking to purchase one just Google "HOB Overflow".

__________________
75 Gallon Planted

thank you typeyourtexture i think i going to make it because i see a lot of them but is sow expensive

Another option is to make an overflow from pvc pipe.

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

FWIW here's a link:

pvc overflow

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

thank you beasibob i think i going to use the pvc overflow because i am little short of money rite now latter i buy a overflow box

IMHO then there is no need to later buy the overflow box. The pvc will perform the same exact function.

my .02

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

if you want to just buy one, get the reef octopus overflow box...works great but u need a vacuum pump

nearly all overflow boxes need a vacuum pump, otherwise they air pocket at the highest point and prohibit water flow.The only issue I have with PVC overflows is the high err very high risk of it failing and draining the tank.

I use CPR boxes they arent expensive at all(around $100 bucks new depending on size) Check ebay and aquabid for a used OF box.

Oh? How so?

And why does a pvc overflow not have the same exact issues of any hob overflow?

FWIW I use a power head to suck out the air at the high point.

And adjust the system so that if the overflow does fail no floods result.

But to me those exact same adjustments are needed with any system where you pump water between two containers especially at different heights.

I am honestly confused an how a pvc overflow would have any more problems than any other hob overflow design?

Still just my .02

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

The designs in DIY's are different, you are relying on equipment that is unneeded(cost) and the type of PVC used, the glue and primer used can all fail, too many seams. IMHO as a professional and a hobbyist who does do anything I can DIY they are more headaches then they are worth. My DIY overflows were noisy, no matter what they always made noise, my CPR boxes are dead silent, I got a 75g cranking directly under my bedroom in a 120+ year old house(so you know insulation is at minimum) and I cant hear it at all, infact its directly under my HVAC return that is in my bedroom not even 2' from my head at night.
My main concern and issues I had were the leaking due to vibrations and the power outages that caused the tank to overflow when the power kicked back on.

Understand about the seams and so on.

But pvc or otherwise the tank should not overflow when the power kicked back on. Even if the HOB was totally filled with air breaking siphon, the sump should run dry before the upper container floods. Which is true of any failure of the overflow. After all even drilled tank can have a snail or whatever plug them up.

my .02

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

a reef ready tank(overflow equipped) that is of by a mere fraction of an inch will cause the higher overflow to stop working.

Im stating that by the time the vacuum pump can keep up with the sump pump the tank would rise well above the overflow tube, it even happens on the overflow box sometimes but when that happens its time to toothpick the air port.

Glad to see problems occur on commercial as well as diy projects.

again the overflow stops working.

So?

that does not mean the upper container will flood.

And whatever does happen could happen with pvc or any overflow.

So one must make adjustments and test the overflow failure condition to insure no flood occurs.

my .02

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

the siphon is delayed when the power is cut, the pump kicks on instantly. I got a back up gene now but we go thru a series of rolling blackouts and just heat/humidity related power failures a few dozen times a year here and every single time my pump filled the tank before the DIY overflow tube could evacuate the air in the bends. Yes adjustments are needed but with a true box its all turn-key out of the box with a DiY you must tweak and tweak to get it right. I am a man of little patience especially when it comes to my tanks.

comercial, diy, double box/u tube, weir, drilled reef type tank, beaslbob traps, superduper bean thingie, all require adjustment to prevent floods should the overflow fail. The sump should run dry before the upper container (usually display) floods.

Once that adjustment is made and the normal operating level of the sump marked you must insure you never add water so the sump is above that mark.


my .02

__________________
fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden