If I was handed a 90g with all the bells and whistles included this is what I'd stock, fish wise...
(1) White Banded Possum Wrasse
(2) Fathead Sunburst Anthias
(2) Swissguard Basslet
(1) Blue Assessor
(1) Marine Betta
(1) Red Sea Mimic Blenny
(1) Starcki Damsel
(1) Annulata/Tiger Damsel
(2) Neon Gobies
(2) Radial Filefish
(2) Helfrichi Firefish
... I prefer stalking a lot of small, personable fish, as well as trying to pair up fish when I can. Good luck with the new tank :dance: