You dont need a skimmer or hob or sump for a sw tank. You who are saying this need to research the basics before giving advice. Wrong advice at that. Do some research and try and answer it again. A tank can be very healthy with only LR, good circulation, and water changes.
And why are y'all arguing on another members thread about your tanks? This is someone else's build thread.
PROTEIN SKIMMER ADVANTAGE:
Protein skimmers help maintain low nitrate levels by retarding nitrate buildup. They remove organic waste before it has a chance to break down and release nitrogen compounds. The use of a protein skimmer is essential in reef aquariums where a very low nitrate level is crucial for coral health.
SECONDARY BENEFITS
The many secondary benefits of protein skimmers improve the overall health and quality of water in your marine aquarium. In addition to efficient waste removal, protein skimmers also:
Reduce phosphate to help prevent aggressive nuisance algae growth.
Remove any biological toxins released from corals, algae, or invertebrates.
Promote proper gas exchange and increase oxygen level for healthy inhabitants.
Help maintain proper pH by preventing acidic condition due to carbon dioxide buildup.
Help support a large bioload, particularly when used in conjunction with a sump.
Remove oily surface wastes to help improve light penetration in your aquarium.
Improve REDOX and reduce disease-causing organisms when used with an ozonizer.