Overflow & Return Locations for 9 ft Tank

[CMO]

Starting to design a new long tank and trying to figure out the best location for the overflow(s) and return(s). I don't have any experience with a long tank like this and could use some advise.

My thought is that putting a single overflow and return on opposite ends of will tank will create better circulation (I will still have power heads inbetween for additional flow).

What do you think? Should I add an additional over flow or return?

 

[Johnson]

I would add both and spread them out or do overflows in each corner and the returns in the center but about a foot apart

 

[Nstocks]

External overflow box.

 

[Johnson]

External overflow box.

Keeps it nice and clean. That's what I'm using on my build eshoppes eclispe L 1000gph

 

[CMO]

I want to go with internal and bottom plumbing so I can push the tank flush up against the walls. After more research I'm now thinking of the following design with a second closed loop system for flow. Will 6 outlets on one pump be enough flow for a tank of this size (returns will add additional flow) with sps reef? I'd like to keep it clean with no other power heads. Thanks all

 

[Grey Guy]

How will you hide the discharge ports?

 

[MarylandTang]

That's a lot of holes in the glass... A few thoughts:

1. Make sure your tank isn't truly flush with the wall - leave a minimum of 1" -- things will splash and ruin your walls
2. The dual overflow/return option as you included is probably the best way to do the water exchange if you have ruled out an external box. You may have a harder time than you think hiding those Oceans Motion units -- and it looks like you have one right at the front of the tank.

 

[CMO]

The more I read about the ocean motions sounds like they could be a pain in the long run. Leaning towards fixed outlets now on a pump (or pumps) with random flow generation programs (Vectras etc.). I will build rock work around the outlets to hide the closed loop returns. Will be putting in the order with Crystal Dynamics later this year so still in the planning stages and open to more thoughts / suggestions. My biggest fear with this many holes drilled in the bottom is leaking of course. The bottom will be reinforced composite vs. glass so hopefully that hedges any risk. Thanks

 

[Grey Guy]

There are heavy duty bulkheads that make a much better, bigger seal than the standard ones. It is disconcerting to put holes in the bottom of the tank. There are lots of photos, and videos on line of different setups. I like the idea of coming in from all around the top of the tank.