I'd say you made a good decision going nano for the first tank. If you are diligent and read enough to have an idea of what is going on in the tank you won't really have problems. A larger tank might mask poor management anyway, so having a little tank like this will keep you on your toes a bit! When I was first looking at tanks people at the fish store were like "oh man your first tank you need a big one!!!"
Nope! Like you, I started with a nano and everything was fine. There was no way in hello I was going to spend thousands of dollars on some huge setup without even knowing if I liked reef tanks.
You tank looks great, especially for being a month or so old. As far as tips, I will say from my personal experience don't worry when your tank starts getting algae and cyano, it seems like every new tank goes through that before it is 18 months old. Secondly, don't be deceived by a healthy looking tank. Some problems can take months to really show that something is wrong. In particular I am talking about cleaning out your filter sponges every water change, and feeding your corals. I neglected to do these since my tank looked really great for over 6 months, but then things started dying.
Looks like you're off to a good start, and if things start to look off just post here and try not to worry