What does your skimmer pull out? The skimmer pulls out food that your corals would eat. I have had protein skimmers for decades and was so happy to find a replacement for them that worked. The only reason to have a skimmer with a scrubber is if you have a fish only salt system because the extra food would not have to be there if you do not have corals.
I have never had a reef tank with a skimmer that didn't need water changes. I have a 10G nano with a scrubber thats been almost two years without a water change.
Also, I am aware I didn't show any other tests then the nitrate and phosphate. I did these because its virtually impossible to get both of these to zero without water changes!!
The ocean uses algae to do its filtering, I am just simply replicating how nature takes care of its water.
For years I was really against scrubbers and stood my ground about how well skimmers worked and told everyone that scrubbers where the most horrible thing to use on a tank. Well, I must say that I have had to eat a lot of CROW lately!!!!! Scrubbers work for every Reef tank I have.
You should try a scrubber yourself and learn what its all about. I have bee keeping SW since about 1978 and the scrubber is the most amazing tool I have found for keeping a SW tank yet.