OK...
1- the light blue is the decanter, where the water flows from the botton to the upper and usually the "dust" stay ther don´t going to the rest of the SUMP.
2- the dark blue area is where the Denitrator and calcium system (jaubert) stays, where I have three separate areas with 4in substrate that will create a low oxigen zone with low PH and removes Nitrate and also ads calcium to the system... As this area tends to stop working with the time we create three separate divisinos and renew one each year.
3- the yellow area is also the largest one and that´s why is where I place Skimmer, carbon, Calcium reactor and etc...
4- Bubble break
5- refugium with algae and substrate.
Hope you can understand my terrible english.
Best regards.