Yep, everyone has a different philosophy on how to set up their tank. I like the DIY moding that can be done on the nanos. That doesn't mean you have to do any or all of them. It really depends on what you want to do, are comfortable doing. Some people make nanos a lot of work testing, dosing and cleaning daily. Others like me dont, I clean my glass, rinse the filter media and empty skimmer once a week. Do water changes every 2wks. Dose 2 part every morning. Test once or twice a month when I think about it.
Chaeto will do a lot as far as using up excess nutrients / preventing nuisance algae. It doesnt need "gobs" of light but the problem with just using spill over light is that it only reaches the top part of the chaeto. You need to light more of it. Think of a house plant that only gets light on 2 or 3 leaves. Some people just drop a small water proof light into the chamber, I have misgivings about putting lights under water though. I have misgivings about jumping out of perfectly good airplanes and getting on ships that sink on purpose too but people do it all the time.