Yes, because coralline won't grow in horrible conditions, it's quite fussy.
I don't know what's going on with your ammonia tests now. If the tank doesn't smell bad, and some stuff is starting to grow I would be tempted to aquascape the tank and leave it alone with a couple of weeks except I'd likely do a water change after a week. Let the thing stabilise, settle down a bit. If you want to , in a week or so's time, if you see any small crustaceans hopping around, add a couple of small blue leg hermits, or something with a low bioload like a cleaner shrimp. If you feel nervous, don't add anything - wait till you're confident you can see living things.
You have never mentioned what you're going to do re: water changes, and I think, as I don't see you with a skimmer, that is something for you to think about.