I have 3 rainforest 66's how would i go about connecting them to 1 revisor so i would have to only nute and test 1 tank?

i tryed putting 3 150gph pumps in each rainforest leading to the main tank, and one 450gph in the main revisor split 3 ways to each rainforest, and the revisor alawys seems to flood.

wats the right way to do this?