Got that third water tank plumbed in to the main house line the other day. I was smart enough to put a shut off in front of the addition, so now I can isolate each of the tanks, or any two of them. I also put in a wash out, there between the blue shut off and the red, so that when it's time to get the gunk out, I can just open that up and rinse it out. I could also hook in a hose or fire truck filler line if I wanted to drain all 3 super fast.
and, just a reminder about how it gets warm, in the shade, some days.