I have the same tank, I believe. AGA 90gal with one overflow 1/4 way across the back wall.
I have a Quiet One 4000 running through the 3/4 return. The Locline is split into two 1/2" returns. One aimed at the back wall and slightly down, the other is aimed at the surface of the water at the front corner of the same side.
For in-tank flow, I have two Koralia 3's. I have my Aussie Duncans indirectly in the flow of one Koralia, they seem to love it. The other Koralia is on the back wall between the overflow and the side. It's halfway down the back wall pointed slightly center and slightly up to adgitate the surface further.
I FULLY intend on switching them out for the 12V controllable Koralias when I get some extra cash.
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