Sequence ReefFlo Dart Water Pump and (2) 3/4" swirls possible?

[Glove]

I purchased a Sequence ReefFlo Dart Water Pump and (2) 3/4" swirls used. I know for a fact the dart pump was only powering the 2 swirls. Now the max gph for each swirl is 850gph and that pump puts out 3600.
So I pop over to the head loss calculator and play around with some different diameter pipe, and head loss.

I assume the sequence dart is the sequence 3600 seq12?

I found if I have a 5 feet of 3/4" pipe (my tank is 6 ft long) delivering water to the swirls with 3 90's and zero verticle head (pump sets behind tank at the same level as the bottom of the tank), 2 pipe exits, one entrance, and 1 coupling (wich is really a "T" so that will restrict even more, yes?)
This give me 1072 GPH
I will be reducing 1.5" outputs down to 3/4". Is there a certian way to do this? Right now its reduced after a "Y" directly after the pump and is set up to use flex hose.
I want to remove the "Y" and install a 2" 90 then a 2" "T" then reduce down to 3/4 right befor the swirls.
I dont want to pull the water from the sump to the pump the to the swirls, I would prefer to "somehow' tap into the acrylic tank and do a closed loop.

Now I have two overflows in each corner of my 11" deep tank. Each has a 1" bulkhead in the bottom and a durso pipe standing up. I think there room to drill a hole in the very back of the overflow box (rear of the tank) and install a 1.5-2" bulkhead to pull water to the pump. What size bulk head on each end would supply the pump with no problem?

lol.. thats really confusing. I will snap some pics and give a better visual.
I have a 3600gph pump that I want to run 2 3/4" swirls from. Maybe 3 swirls. I dont want to blow seals. My only optin for suplying the pump is drilling into my overflows and I am not sure a 6x6x11 box will feed a 1200gph MAIN pump AND a 3600gph dart to feed the swirls. I guess I might try cutting teeth off the overflow if it gets sucked dry.

[Glove]

ok here is the back of the tank. I have enought room to fit the pump in there.
http://s112.photobucket.com/albums/n186/Glove_03/th_MVC-871F.jpg
here is the pump
http://s112.photobucket.com/albums/n186/Glove_03/th_MVC-874F.jpg
and the overflow boxes I *think I can tap into.
http://s112.photobucket.com/albums/n186/Glove_03/th_MVC-872F.jpg

[Glove]

sorry for the small pics- i changed camera settings and forgot.

[Glove]

bump
I could use some ideas

[Glove]

ok, so I have came up with a rough idea.

The input to the pump is 2". This will be fed by 2 bulkheads I plan to locate inside my 6x6x11 overflows. I am concerned the pump will suck the overflow dry- ill have to try it. Should I use 2" bulkheads? it will be tight- I would prefer somethinig a bit smaller.
The return from the pump is 1.5" that will be split from the center to feed the two sea swirls at each end of my 6ft tank. I will run 1.5" pipe from the pump all the way to a 90 , then to a 3/4" reducer folowed by a 3/4" union to aid in removing the swirls. tHe end of the 3/4" pipes have male couplings that will thread inito the swirls.
Now I do the head loss calculator and with my calculations using the 3/4 pipe, I will have about 800gph. WOW!... from 3600 to 800.
Does it matter where I reduce the pipe from 1.5 to 3/4"?
Seems like a lot of pressure loss and a huge amout of back pressure on the pump.
I purchased the pump and swirls used and I believe the pump was used to power just the two swirls.

[Glove]

http://i112.photobucket.com/albums/n186/Glove_03/MVC-876X.jpg
This is the idea.
If I set it directly behind the tank- there will be almost no vertical head loss. If it sets below the tank, it will need to travel 5 ft up to reach the top of the tank.
Im still amazed at the head loss of almost 2600gph just by reducing 1.5 to 3/4" ouputs. I think I am brain farting something here. :confused:

Now the trick is how to feed the pump. I have considered tapping into the bottom of the back of the overflows, but they go to the sump and I dont want to draw so much from the box that I take away the supply for the sump.
My other thought was to drill the back of the tank, sorta high so I dont have to completely drain the tank. I dont like that idea all to well, but it might be my only option.

Id love to hear some thoughts or suggestions.

[Glove]

http://s112.photobucket.com/albums/n186/Glove_03/th_MVC-878X.jpg

http://s112.photobucket.com/albums/n186/Glove_03/th_MVC-877X.jpg

getting the pump behind the tank would be tight, but I have very little room under the tank. I could make a shelf or something, then I need to drill the stand.

(larger pics can be seen here, sorry again, not sure why they get shrank)
big picture (http://s112.photobucket.com/albums/n186/Glove_03/?action=view&current=MVC-878X.jpg&refPage=&imgAnch=imgAnch1)