everyone is gonna tell you something diferent but in my case im on the low maintenance side so im using the basic but in my experience necesary things in my sump I do have a Skimmer, I dont have socks in the input water because they need to be cleaned washed or rinsed every week so I just let the water enter the sump as it comes from the aquarium , then I have an small phosban reactor usin rowaphos as a silicate and phospate mechanical filter, same way I do have a calcium reactor to keep the alkalinity and calcium that my corals consume replenished (not necesary if it is fish only tank), and then I do have the magical thing the marinepure block that is where all the magic happens and keep my aquarium free of nitrites and nitrates with no sand and no live rock, thats all I do have downthere
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