Overflow questions

[russ13]

Hey gang,
Installing an overflow on a 100 gallon corner tank and I have a few questions.
1 what size should the drain and return be?
2 the overflow is going in the back corner of the tank, how much room should I leave for the drain and return line.
Going to be a durso overflow and a single return line not sure the size of the return pump yet.
Thanks reefers

 

[mcgyvr]

Hang on back overflow or drilling the tanks back wall?
Can we convince you to do something like this?
https://www.bulkreefsupply.com/eclipse-l-overflow-box-1000-gph-eshopps.html
or
https://www.bulkreefsupply.com/16-shadow-overflow-synergy-reef.html

 

[laverda]

You need to dicide on the flow rate you want first. It costs money and produces heat to pump water up 5-6'. I would aim for 5 times tank capacity. There is no real benifit to more flow, although many people recommend 10 times tank capacity for flow.

If can only do a single drain make it oversized and put a large screen on it so it can not possible become obstructed. I find a simple 45 degree fitting and screen at the top is quite, simple and efficient. It will also handle changing flow rates without having to tune it.

 

[Akram]

You need about 1000 gph return, and an overflow that allows 1200 gph.
No exact science but something to get you started.