Thank you Mebbid,
The first two compartment are for automated water changes. I bought this used and the guy who designed it for salt water has used the first two compartments for automated water changes.
I haven't thought about the size of each compartment yet but you have given a good idea of the sizing. Thank you.
Also I am thinking to use lucky bamboo as plants in sump as they are easy to maintain and if they grow big i can use them in the home for decoration. Any thoughts if its good or bad.
overall I am having 5 kg's bio media in total.