with regards to the skimmer/fuge question, I don't think either is really necessary, provided you keep up with the water changes.
I added the fuge because I thought it would be cool. I didn't really expect it to help keep the algae in check (it didn't - more on that coming) and I really didn't expect it to become a food factory (it did - big time).
I almost never fed the tank and the pod population was so big in the fuge that my neon dottyback learned how to swim into the outflow tube, up and over the tank and into the fuge's third chamber. At first the dotty got stuck and I'd have to get it out (swam into my hand after a couple of times). The dotty eventually learned to go back and forth.
With those small fuges, if you don't use a good macro algae, and you don't prune it continually, you end up with a garbage dump in the back. Mine became so thick with algae that I had to take every piece out and start over with a leafy, slower growing algae.
I picked up a tiny skimmer after an awful outbreak of bryopsis, thinking it might help but it didn't. I think skimming on small tanks depletes too many important elements.
That leads to dosing, which usually leads to overdosing.