I think upgrading either is unnecessary TBH. The skimmer does need some time to break in -- it took me a while w/mine -- but once it's broken in it works great. I don't keep much SPS (part of why I felt comfortable going w/the Max Nano) but if it was for mainly keeping SPS I don't think the Max Nano would be a tank I'd recommend. I think you could do it, but to me the tank is more of either a great entry level true plug-and-play, or great for someone who is keeping a lot of softies and LPS and wants an easy low-maintenance setup.