I initially started out with a nuvo 20 and immediately upgraded to the nuvo 40 in less than a year. The only thing I don't like about AIO tanks in general is the limited availability of options due the dimensions of the baffles. Do I regret it? No. my biggest gripe with my nuvo 40 is my return pump chamber. With Sicce 2.5, I have to remove the the hose and back whenever I either clean or do anything on the return pump chamber. I currently have the icecap nano skimmer and intank media rack. a lot of people didn't like the first gen aps stand due to no shelves, but the second gen gives you one. I maybe upgrading to IM's 75 gal hopefully this year. Also, I recently upgraded the lights with orphek compact and looks so much cleaner compared with AI Hydra and Prime. Haven't checked par with orphek on but the corals don't seem to mind right now. Going back with limited space. The orphek is mounted with orphek's universal mount. I have to remove the mount everytime I need to access my media rack. I didn't need to with AI combo due to smaller mount size. Once I get the tank upgrade, lights will be ceiling mounted.