welcome to R2R!
what size of that is that? looks like a 10 or 20H?
reef are fun eh?
what lighting do you have? that will determine if you can keep SPS and other high light corals.
I am a big fan of LPS and soft corals they just do it for me.
look around at other reefs nanos in particular and see what you like. go slow and start off with east ans cheap corals ( just not once that will take over the tank like GPS cloves and the like.)
another option is and you dont see many of these but I really like them in a marine planted IE. macro algae tank there pretty hardy easier to keep ( kind of) cool colors not as many as corals tho but it is a fun tank.
I have a rock flower new, nano click my "build thread " badge under my name if you want to see it.