I resealed and leak tested the tank this weekend. Now I just have to get my acrylic, plumbing supplies, and drill the tank. I am still working out the details on where I am going to draw my water from for the closed loop. I WAS planning on doing a Coast to Coast Calfo like system that drew all my water for my sump AND closed loop. When I plugged in numbers on RC's calculator it suggested a minimum of 48" linear for my overflow. I was planning on 20" total for right around 3000 gph. I may have to rethink how I want to draw the water for the CL system. Anyone have any ideas?