I don’t have a skimmer on any of my tanks, but my parameters are always good and water always clear. I do think skimmers could help though if you don’t want to do water changes every weekI don’t agree with anyone who says no protein skimmer for smaller tanks. Is it 100% essential? No it isn’t. But it’s going to keep the water cleaner and reduce the need for more frequent water changes. It makes life easier. There are a lot of nano skimmers though that are junk and the good ones are expensive.