The fact that it is fallow mean you will need to stick slowly. Some on here will tell you the cycle crash but I can say with certainty that this is t entirely true. I added too many fish back into a 90 after going fallow to irradiate ich and had a huge ammonia spike that I had to do huge daily water changes and pull some fish to control. Also cycled a 210 gallon tank to remove 2.0 ammonia daily and kept dosing for 5 days after reaching that removal rate and put 3 5-6”
Fish in and the spikes the ammonia and caused a bacterial bloom. So add slowly regardless of how well you think the bio filter is established.
I think the puffer will get along with most fish but can become an apex predator if under fed. I have over 40 fish in my 210 reef but only 8 larger ones (tangs and rabbits) the rest are gobies blennies etc.
Only three Triggers that I will even try, pink tail, bigger and Blue throat as they are supposed to be the most community capable. I have had huma huma and Picasso turn violent and take out panther groupers three times their size. That being said, maybe if I had fed more frequently each day who knows.
If you can hold off on stocking the blue hippo and QT other tangs to introduce all at the same time I have had a lot of luck with mixing tangs. Have 4 in a 110 (smaller like lavender and lieutenant) and 5 in my 210 (Sailfin, dijardini, Tomini, blue hippo, scopus) with two magnificent rabbits. Have a purple upstairs in a 75 but he is slated to move into one of my predator tanks because I can’t have crabs and snails for clean up as the puffers eat them.
Other colorful fish for that tanks could be some of the smaller Angels (not necessarily dwarfs but they could work) but also not the huge ones. Night get away with a single Queen or something similar but not multiples. I’m looking at a tank for Queen, Passars, French, Imperator and maybe a Blue face or Majestic).
The damsels are what I would see as the main problem to stocking other smaller to medium fish. You could use anthias in place of damsels as some of them can be bigger but research as some like the Queen Anthias are beautiful but even experienced fish keepers have issues with them.
I have kept many expert only fish Marine Bettas, frog fish, mandarins, etc but I provide their starter foods like pods, live feeder shrimp for the betta etc. then wean them to frozen.