In that case, you can move the blue & red baffles to the left so that the skimmer & reactors are together in the 1st compartment. (provided all these equipment can operate properly at the skimmer's required water level.)
Then make the 2nd compartment between the red & green baffles your refugium for chaeto. As you'll be having lights shining down into this compartment, use darken glass for both green & red baffles to minimise light transmitting into 1st & last compartments. This would reduce unwanted algae growth.
Lastly, install a filter comb on top of the green baffles to minimise break away chaeto from choking your return pump.