Sounds like a good setup! I agree with the previous post that you probably don't need the second filter before the return unless you find that the pump is getting too dirty too quickly.
Carbon is cheap and it does "polish" the water. It also can help out if something decides to release some nasties in your tank.
My two cents.
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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