Yes I have follow Alex's build for a long time that was quite the project and now he is even going bigger with the new house. I have a 150 gal stock tank I'm using for the sump so with that and a refugium tank I will have about 1200 gallons in the system. I will most likely add a frag tank but that's totally not planned yet and I have no idea what size it might be.I assume you have also viewed Alex G's build? He's using some huge containers for the sole purpose of increasing water volume and providing emergency water. They will be tied in to the system. Seems like a great idea for bigger systems like this. Maybe something to consider?