I have two big block of marine pure which is at the back of the first compartment. I can't really see it and it very brittle so i don't move it what I do most of the time is to change the filter socks.
2nd compartment is Skimmer.
3rd compartment consists of 500grams Biohome, 6 Marine Pure cubes and 500grams Corals chips. I just suck dirt that about if the build up is too much. (What other medias should i try out?)
4th compartment consists of Carbon and Phosphate minus in a small media bag return pumps that about it.