need sump ideas for 240gallon conversion

[Achilles1882]

OK.... I'm in the process of upgrading my 4x2x2 120 gal to my new 8x2x2 240 gal. I have a Lifereef LF-150 sump and a 24" lifereef skimmer and i know that they won't be enough for the sump volume needed. I also have a 75 gal and a 55 gal, both of which are 4' in length, that i can use in the plumbing. So, the big question is what would be suggested in the plumbing of these together so as to provide sufficent sump volumeand a refugium. Any ideas or suggestions would be appreciated. Thanks, Thomas

[Mr.Lloyd]

I bought a 325 gallon agricultual tank and added 260 lb of live rock.This is plumbed to my 300 g reef tank.It has a lid so evaporation is not a problem.