If you can, the easiest way would be drill all the tanks with "in tank" overflows (you have small tanks so ripping them down to do so isn't that hard....just ripped apart my 180g and lifted it with the help of 4 friends) and stack the tanks one over the other so that the top runs to the middle then the middle to the bottom then to the sump which returns to the top again...have used this system in the past with 2 50g and a 40g sump...never had a problem.
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