Connecting my two rainwater tanks

Finally got my two rain tanks joined up. I had one on each side of the house, but only really needed/wanted it on one side. So the challenge was to join them up from a single source – the patio roof and have as little piping connecting the two. Tank A maintains the inlet & overflow, with the connecting pipes at the base maintaining an equilibrium between the two. Now I have about 5,000 litres of water!