Overflow placement - 1 vs 2 returns?

[Easto]

I have unleashed my windows paint skills on this one!

I have a 48" tank
Lighting is 2 Kessil LED

I am going to drill a Bean Animal Overflow.

My overflow box is 4" (deep) x 10" (high) x 12" (long)

The 12" side has slots in it for water flow. The 4" pieces on the side are solid acrylic - no water passes through the sides.

These are the three setups I am contemplating.

1. Overflow in the corner with 1 return line at the far end.

2. Overflow in the middle with 1 return at the end

3. Overflow in the middle with 1 return on the left side and 1 return on the right side.

From my understand all of these should be fine as long as circulation WITHIN the tank is good.

I planned to go with option 1, but if there is a good reason to do something different I'm all ears.

[reefmandan]

I like option three the best. More returns is better for flow ... especially along the back wall (depending on how exactly you arrange the return flow). I also like three for the placement of the box. The whole idea behind the weir box is to maximize surface skimming, and by positioning the box in the middle, you give more access to surface waters across the whole area of your tank to be skimmed over the weir.

[The Guy]

Originally Posted by reefmandan

I like option three the best. More returns is better for flow ... especially along the back wall (depending on how exactly you arrange the return flow). I also like three for the placement of the box. The whole idea behind the weir box is to maximize surface skimming, and by positioning the box in the middle, you give more access to surface waters across the whole area of your tank to be skimmed over the weir.

Agree #3 is the best option, this is basically what I have in my RSM250 works very well with some directional nozzles on the returns. you may want to add some powerheads to help with lower tank and reef circulation.

[Easto]

For power heads I have an MP40

I'll probably add 1 or 2 Korillas once it's up and running and I see where I need the extra flow.

[Aquattro]

My return simply returns water from the sump. I only have (maybe) 400gph, so regardless of how many lines I use, it's not adding to flow in any amount worth worrying about. The only time I used dual returns was on a 150g running a MAG 18, and even then the flow was minimal.
IMO, use the return pipe how it best fits and address flow using pumps designed for that.

[e46er]

A centered overflow I feel would be SLIGHTLY more beneficial for surface skimming but that said an end overflow would be much less intrusive and allow for easier flow in the tank and less potential dead spots sooooooo at the end of the day I'd say they cancel out. Personally I'd go option one but this is just my thoughts.

[Easto]

Yah, I was leaning towards option 1 as well. I guess it's like they say - more than 1 way to skin a cat.

[Aquattro]

I would do option 2, just to avoid looking into the side of the overflow. Also has greater appeal for resale, I think. I almost did a corner overflow, but choose center. Shortly after the build, i decided on a different location for the tank and would have ended up with my viewing side having the overflow. Glad I went with center

[albert_dao]

Multiple returns is a waste of time. The return flow from your sump will be negligible compared to the output from a few appropriately sized powerheads -- especially once it's been divided in half and run through additional elbow fittings. It would be like blowing through a straw to try to change the direction of air from a 14" fan.

I'd just go with a center overflow and have the return come through the overflow

[Aquattro]

Originally Posted by albert_dao

I'd just go with a center overflow and have the return come through the overflow

That's what I have, but I only run a single durso. Any concerns with a fourth hole in that location?