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It is enough as long as you maintain your BB appropriately with lots of flow and weekly siphoning of deititrus from the bottom.
Also, there are mods than dvan mentioned may help.
Not to mention the RDSB mentioned, refugia, GFO, carbon dosing etc, husbandry, not overfeeding which all play a huge role in nutrient removal so don't get too bogged down on skimmers or the folks that will come in here and tell you to buy a 5 grand skimmer for your 90.
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