Grizz's 300 gal 8'er / LED Heat sink build / Opinions on LED lay out needed

[The Grizz]

No pic of what I have in mind but it will go something like this........

Return pump - check valve - OM 4-way - each port off 4-way split into 2 for a total of 8 returns ( only 4 running full at a time ) in threw back of the tank as pictured in the concept design.

Coast to coast OF - 1 1/2" drain at each end of tank - teed together to a 2" - 2" to 1" tee that will feed my 3 media reactor's - second 2" to 1" tee to feed skimmer - third 2" to 1" tee to feed chiller - end of 2" into filter sock in sump.