Welcome!
I have a few questions:
- what kind of fish are you going to put in your 100g?
- are you going to use foams in your AC 500s?
- are you going to have a sandbed or will your tank be "bare bottom"?
- will there be any corals in this tank?
One thing I will say right now is that with two AC 500s and two 802s, you have more than enough water movement in the tank already, especially that you've also got a skimmer.
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