What Configuration For 40gal Breeder Overflow and Return?

[Enigma]

The skimmer is an SWC 120 cone (I don't have it yet, it is my Mother's Day gift).

It has an Atman 1100 pump. I'm having a hard time finding numbers for that, but I've only had a cursory search.

Based on the SWC website, the skimmer is good for 55 gallons with a heavy bio load. This system will be around 55 including the sump.

I have an Eheim Compact 2000 as my return pump right now, and I really like it. It is very quiet. I would prefer to use an Eheim in this system.

When hubby and I have all of the plumbing done I'll post the exact set up. I'm guessing when I use the calculator right now, but I should be close. I think the Eheim 1250 came out around 300gph (if I remember correctly).

I have one little 425 gph powerhead that will go in this tank for now I'll be adding a second cheap (larger) one. (Maybe I'll get my twin mp10s as a gift from hubby . . . If I behave )