400 gallon acrylic question

[Dungston]

Just bought a 400g 96x48x20 the sump is a 100 gallon Rubbermaid goin to be located behind the wall back wall of the aquarium in another room. It's a used tank and was drilled funky, it has a center internal overflow with 2x1.5 bulkheads for drains and 2x3/4 "bulkheads for returns . I bought a new reeflo dart-snapper hybrid for the return . I'm tryin to stay away from the closed loop because I hate seeing the PVC everywhere lol and possibly buy a couple mp40s/60s for more flow. My thoughts were to drill two more 3/4 bulkheads in the open corners and a 1" emergency drain in the middle of the 2 other drains and use two standpipes or hofer gurgle busters on the 1.5s since a Durso would be tight fit. Will that effect the strength of the aquarium it's 1/2 acrylic?
I'll get a pic of the tank and overflow

 

[Dungston]

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[Dungston]

I also would be using a ocean motion 4 way on the return into the 4x3/4 returns . Unless the thing doesn't work right (it's used) then ill plumb it out just return 4 ways.

 

[Dungston]

Any help or opinions are appreciated , I'm new to plumbing my own tank before this had a 90 gallon corner I bought from a friend that was already set up. This is also a bit bigger lol

 

[Dungston]

Nvm already drilled

 

[viggen]

Just saw the thread... What did you decide to do?

Doing a closed loop you can easily accomplish this and not see any PVC pipe inside the tank. Preferably drill holes on bottom of tank and not the sides

 

[Dungston]

Thanks for the reply , I ended up drilling the 2 extra return holes and another 1"drain I think it will work out. All the holes are drilled in the bottom and in the overflow, yea I've seen a few CL that look good w no PVC and if this isn't enough flow i may resort to that. I can always upgrade my pump and add some sleek power heads