Skimmer?

Dissolved organic compounds (DOC's). These can break down and lead to increased nutrients (phosphate/nitrate especially), and can be irritating to hard corals. Skimmers are almoast required in tanks jam-packed with stony corals, and/or messy predator tanks (lionfish, frogfish, mantis shrimp, eels, triggers, etc). They are not really required on nano tanks (where water changes are easy), or on softy or fish only tanks.
 

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