yay! I want a royal gramma for my ten gallon. it's two months old. I would recommend zoas and mushrooms definitely to start out. things are like weeds. once you see them start to do well try some LPS
, like candy cane coral or Duncan's. Duncan's are great, super easy. most LPS
require additional feeding though so just be prepared to feed them meaty foods. live aquaria has a beginner coral section where you can read about them online. super helpful.
also you want to start monitoring calcium before doing LPS
. get yourself a test kit and a calcium supplement because chances are your salt mix just doesn't have enough calcium in it right now. new tanks eat up calcium like crazy, and it's really important for crustaceans and stony corals and some soft corals to have enough calcium in the water to support their calcium carbonate skeleton.