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Is a 90 gallon small? I don't run one anymore, things are thriving, nor a sump or fuge.....reefing since 95, so I guess you've got a decade on me....Ok heres my two cents. I have kept reef tanks since 1985. If you keep only corals probally not needed with partial water changes every two weeks, MOST aquarist want corals and fish in their tanks so i would say skimmers area HUGE help. KNOWLEDGE TRUMPS ALL> Having said that most sumps and skimmers with return pumps etc cost at least a Grand or more depending on tank size. Small tanks with good filtering and water changes consistently like I stated can get by with no skimmers. Most Aquarist have lots of CASH sunk into their systems so why Risk algae outbreaks disease and poor water quality. Skimmers Give u some Insurance against such. Again KNOWLedge is the KEY!
OLDEST question in the book , LOL