I think on small systems with regular water changes skimmerless is fine.
Im going on the assumption that we are thinking about what we are stocking, our feeding regimen, and when we do our water changes.
With the normal changes and a good bio filter (LR and LS) the water for the animals should stay replenished with trace and low nutrient levels.
Kdaddy - I think a solana starts to push the envelope for size as water changes of the same volume begin to get more tedious. A 34gal also pushes the envelope of the density of the livestock. I used to run a Tunze nano doc when I had my solana running and it did pull quite a bit.