Do I really need a protein skimmer for a reef/fish tank? 30 + 36 gallons?

Do I really need a protein skimmer for a reef/fish tank? 30 + 36 gallons?

Protein Skimmer 200-500 Gal Ocean Coral Reef Fish Saltwater Aquarium Pump 61F4E33796B84DECA808589B59554227 Tucker Murphy Pet

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How many bristlenose plecos would be good for a twenty-gallon fish tank? I plan on moving it up to 30 or 40 gallons within the next year. What would be better? I

Coralife Marine Filter W/Protein Skimmer, 50 GPH is designed for marine and reef aquatic environments up to 30 gallons. Protein skimmer included. Includes large filter cartridge. Ideal for consumers stepping into the saltwater hobby for the first time.

Coralife Marine Filter with Protein Skimmer