external overflow what do you use

[Joedaddy]

hi fellow reefers, i am setting up a used 180. I do not want to get it drilled. I need advice on an external overflow, what are you useing I need a flow rate at about 1200-1500 gph thank you

 

[bertoni]

That's an enormous amount of flow for a sump. I'd probably target no more than 500 gph for that size tank. LifeReef.com makes overflows, and one of their products might work.

 

[Bri Guy]

flow through the sump and flow through the tank are 2 differant numbers.

2-3x/hr turnover for sumps, and up to 10x turnover in tank for wave action. And for fuges i get mixxed numbers from the 2-3 to 10

As for the overflow, Ive heard good word on this one (actually ive not heard much good word on any overflow, but they can work)

http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=3589&N=2004+22778
Just the SOS prefilter, not the whole thing.

 

[sjm817]

If the tank is not set up, you really should get it drilled. Its not hard to do. If you do use a siphon overflow, use a Lifereef. They are the best, most reliable out there. Since it is a 6' tank, I would want either two overflows, one one each end, or one large one in the middle to get good surface skimming. for flow, with dual overflows, or 1 large one, you would have 2 U Tubes. I like to see a minimum of 200 GPH through each U Tube, so no less than 400 GPH. 500 - 600 GPH would be good.