Quick look and the fusion Pro 2 just looks like a newer/modified Nuvo. I do like the additions they've added such as adjustable baffles on the overflow weirs to adjust height, a lower area of the false wall in the middle for emergency overflow in case the weirs or regular overflow path gets clogged, they now come with a nice looking mesh lid, include an upgraded mightyjet dc 326gph pump, and 1 media tray and 1 filter sock. The only useless thing imo is the tiny micromag algae scrubber. I would not hesitate to buy either of these. I'm partial to the 25g lagoon dimension over the 20gal.