everything seems good besides your nitrate..i am assuming you added the sand recently, which could be a cause for your nitrate to spike. what are you using for filtration?
since you have a nano- many ppl on here made mini fuges in the filtration chamber..look thru the threads
i say that you should add some zoos, they are easy to keep and are great to look at. Perfect starter coral. I have over 20 species in my tank, and now I want to keep it all zoa's. My light is off right now so they are all sleeping. Check out threads that have anything to deal with zoas, you can see all the different kinds. My favorites are Jolly Green Giants, and of course Armor of God. I got a whole bunch today, so 2m i will post a new thread showing them off