Dream sumps design advice

[Lovetoclown]

I am in the process of upgrading from my 46 gallon 3 year old tank to a 320 gallon envision acrylics tank. I built a sump/hobby room on the opposite side of the wall. I need help planning the new sumps. I am going to use two 4ft 75g tanks. I can either put one above the other or staggered one behind the other. The return and skimmer are both external. I was thinking about having one tank house a frag rack and the macro and other plants and rock. But I would love some advice on how many chambers, where to plumb in the skimmer, where to pull water from to feed the refugium or where to return water from the refugium. Any info would be great! Thanks.

 

[Lovetoclown]

No one.

 

[Reflective]

So if one tank is going to house the frag rack, macro and rocks, what's going to be in the other one?

 

[Reflective]

I would suggest having your refugium section be the first thing the water from the tank goes into, since it just seems the 'dirtier' water would be better for the plants. Also having one sump over the other means you could gravity feed the second sump, and it leaves more floor space for other stuff in your sump room.