Maybe a little phyto now and again. Other than that, the calcium, alk/buffer, and mag suppliments.
All that other stuff you can buy isn't worth it. For example something that says it will promote coral growth or better promotes coralline growth. Look at the ingreadiants. Everything in there can be found in a water change.
Leave the other additives on the shelf, you really don't need them.
In the case of xenia or mushrooms, they do like heavier traces of iodine, but you need to be careful and have a test kit for it.
Why bother with a nano, a water change will do it all.
Thomas