120 Gallon Overflow Question

[guitaris70]

Ok so I'm moving within 5 months and I have a 120 gallon tank and stand I just got but I'm not going to set it up until we move to the new house. I have a 20 gallon tsunami sump that's going to be setup with it. I was talking to my lfs earlier and they said I'm going to need 2 overflows in it or to drill it or I will not have enough flow, can I do 2 overflows and have a return pump with the correct flow to return what it's bringing down? They said it would be hard to have a 10x turnover rate. Also I've never owned a drilled tank what makes it so much better and what's the real point to it is it the same as an overflow in a sense? This tank is a five foot long 120 gallon btw and I'm going to be transferring my 54 gallon reef tank to it.

 

[cromag27]

You don't need 10x turnover. in fact, that's at the extreme high end. 3x - 5x is sufficient. in tank flow will be handled by powerheads. Single Herbie drain is all you need. drilling a tank is preferable because it's safer than hang-on-back overflow boxes. if the glass isn't tempered on the bottom, I'd drill it, install an overflow box and set up a Herbie.

http://gmacreef.com/herbie-overflow-reef-tank-plumbing-method-basics/

 

[guitaris70]

You don't need 10x turnover. in fact, that's at the extreme high end. 3x - 5x is sufficient. in tank flow will be handled by powerheads. Single Herbie drain is all you need. drilling a tank is preferable because it's safer than hang-on-back overflow boxes. if the glass isn't tempered on the bottom, I'd drill it, install an overflow box and set up a Herbie.

http://gmacreef.com/herbie-overflow-reef-tank-plumbing-method-basics/

Thanks