Protein skimmers can be optional. But you'll want to limit the number of fish you add, be careful not to overfeed, do water changes religiously, and occasionally run carbon or a Polyfilter pad.
When you add a protein skimmer to many systems, the collection cup will resemble this:
There are many models to suit all needs, so I would heavily consider getting one.
As far as the cloudy water, what sort of filtration do you have at the moment?
Don't add any fish for a good while, and have a look here if you haven't already:
Setting Up a FOWLR Aquarium



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