Overflow box

[Angel730]

So I recently tore down my 125 and decided to add an overflow box. But lately I been doubting on which overflow box I need to purchase for this tank. I wasn't sure if a overflow box rated 1,500 or 3,000 gph would be too little or too much. If there anyone here that can help me, before I make a mistake on tank.

 

[AZDesertRat]

Depending on the size of your sump you will probably need an overflow rate of around 5x your display volume or 5x125=625 GPH. Even at 10x the 1500 GPH overflow box is more than enough. When you start getting too big you may have an issue with bubbles in the U or J tubes and potential loss of siphon but that is very rare.

 

[vlangel]

I have 2 overflow boxes, can't remember what the older one is but the newest one is an eshopps. They both are essentially the same design with a U tube and they work flawlessly. I would match the overflow box's capacity as close as possible to your output through your return/s. That way no bubbles will build up if the flow is too little,( some bubbles are OK). Remember equipment like chillers and UVs slow down a return pumps flow as do elbows in your plumbing. The best way to know what the flow is through your return is to run the return/s into a bucket and time it for 1 minute. Have the bucket the same height as the tank to account for head loss on the pump.

 

[Angel730]

Depending on the size of your sump you will probably need an overflow rate of around 5x your display volume or 5x125=625 GPH. Even at 10x the 1500 GPH overflow box is more than enough. When you start getting too big you may have an issue with bubbles in the U or J tubes and potential loss of siphon but that is very rare.

I made a 75 gallon sump for this tank. I was actually getting a overflow box kit for a website glass-holes.com. They have this two type of overflow.

 

[Angel730]

I have 2 overflow boxes, can't remember what the older one is but the newest one is an eshopps. They both are essentially the same design with a U tube and they work flawlessly. I would match the overflow box's capacity as close as possible to your output through your return/s. That way no bubbles will build up if the flow is too little,( some bubbles are OK). Remember equipment like chillers and UVs slow down a return pumps flow as do elbows in your plumbing. The best way to know what the flow is through your return is to run the return/s into a bucket and time it for 1 minute. Have the bucket the same height as the tank to account for head loss on the pump.

Will do takes for the tip