I really didn't like this as I would have to have a line to every tank. It finally registered that I could just drill a hole in the center of the top and put in a larger line. I already had a 4" hole saw bit so I went with 3" PVC as the outside of the fittings are 4" and it would be a perfect fit that I could caulk to keep mosquitoes out of my water. The unused 1 1/2" holes would be the over flow holes and I could easily put screen wire over them for mosquito protection. It is also a little easier to do the plumbing as I can get by with only having the inlet line go to three tanks.
I now have three tanks hooked up to receive water. The new hook up looks like this.
All I have to do now is level off 50' more ground, shovel in a lot more sand, move and level five more tanks and do the plumbing only on the bottom of them, and then I can start on the pump and filter house. I'll keep you posted.