It is generally perceived that softies do well with some nitrates. Turning off your skimmer a couple of days a week will cause your nitrates to come up a bit. 5ppm would be about as high as I would go though.
Where do you come up wit. this stuff ?
You have no idea what the tank setup is intended to be, number of fish, how often they'll being fed, much less how much rock there will be, how many corals he intends to keep, what other filtration he'll use. I could continue but I think I've made my point. Your post is total nonsense.
As for the OP. A skimmer serves many functions and if you're unsure you need one then do some reading. Search here and you'll find plenty of good information.
If you were planning on going with light stocking fish-wise I don't think a skinner would be necessary in a softy tank. That's just my opinion though.