I'm in the planning stages of my ~390 in wall tank and have been thinking about what I want to do with my sump. I plan on framing a fish room into my 3 car garage and I'm a little concerned about heat build up in the tank. I've been thinking that I will run external return pumps and an external skimmer. I'll have filter socks, probes, and dosing/ATO/AWC lines, and I might run a refugium. But is there anything else at would go into the sump? With the larger components outside of the sump, is there a reason to go with a large volume sump (besides just adding to the total system volume)?