My very first tank was an 8g. Kept it running for 2yrs till I upgraded. That was 6yrs ago and am now running a 40B. That little 8g makes running the 40B seem like child's play-lol.
If you can successfully run a nano you can run anything!
Sorry, my post wasn't very helpful in answering your question. IMO the best item you can own for a nano is an ATO. Keeping parameters stable are very important in smaller tanks. Swings are less forgiving by far.