something is better then nothing, haha. Just would have to clean it out more often. The skimmer doesnt matter as much, its the bioload the skimmer pulls and how often its cleaned. The smaller the skimmer, the more it has to be cleaned. But it will eventually equal out. I had that cpr bakpak on a 135g and it was rated for upto 60g after 6 months or so, only needed to be cleaned once every week and a half to 2weeks. But I also run carbon in my filtration. So that helps out a bunch for the toxins some corals produce.