Nanos are just as easy as larger tanks, you just have to stay on top of things and it helps if you go slower with them. Before buying anything, make sure you have done a lot of research and are confident that you know exactly what you are doing. Emperor 400s are pretty good filters but before just going with them, you might want to research sumps and refugiums. As for powerheads, I recommend koralias, I like them. My two cents (some will disagree) is to stay away from crushed coral and get some argonite...it makes things easier ime. I guess hydor heaters are good, I never really paid much attention to that. Also research protein skimmers and lighting. You will want to only buy a skimmer and a light once so make sure you buy good ones and usually you get what you pay for. Good luck and feel free to ask more questions. Up at the top is a search bar if you want to find answers yourself when nobody is on to help you. Welcome to the boards, get comfy, the fun starts now.