TBH I don’t like a “standard” 120 mainly because of the 4ft length. If I were you I would have gone for less height and at least 5ft length. That’s what I’m doing for my tank.
I’ll go by your fish list individually:
1. Tomini Tang- This is among the smallest of the Tangs and one I’d feel comfortable putting in a 4ft tank. As for the Zebrasoma I’d say a smaller Zebrasoma like a Yellow, Purple, Gem, maybe the Black etc. is borderline doable but those need that 5ft+ tank if left to me.
2. Coral Beauty Angel- No problem with this one.
3. Melanurus Wrasse- No problem.
4. McCosker’s Flasher Wrasse- No problem.
5. Clown pair- No problem.
6. Lyretail Anthias- I’d probably consider a smaller, more peaceful species of Anthias. Not sure what’s hardy and fits the bill for being smaller and more peaceful, there’s a member called Haydn who keeps them. He’s the person to ask. pcon (another member) might also have experience.
IMO if you want Anthias I’d rather go for a species that stands out. A Borbonius or Sunburst (maybe 2 Sunburst as Borbonius get larger, but not sure how 2 would get along?) would IMO be my choice.
Other fish to consider:
-Basslets (Royal Gramma, Blackcap Basslet, Swissguard Basslet, Yellow / Randall / McNeill’s Assessors, small group of Chalk Bass, Lantern / Orangeback Basslets)
-Hawkfish (Flame, Longnose)
-Shrimp and Goby pairs
-Blennies
-More peaceful damsels (Talbot’s, Azure, Yellowtail, Rolland’s, Tracey’s, Starcki, Neon, Caerulean, Andaman / Allen’s)
-Captive Bred Singapore Angel (Poma Labs)
-Orchid Dottyback (maybe not the best idea to mix with basslets?) / other ORA Captive Bred Dottybacks
-Reef Safe W Caution Butterflies (Atlantic Longnose, Tinker’s, Burgess, Declivis, Mitratus- subgenus Roaps)
-Fairy Wrasses (check evolved’s guide to mixing them)
-Pink Streak / Possum Wrasses
-Leopard Wrasses (hard)
-Cardinalfish (Bangaii, PJ, Yellow Striped, Flame etc.) (Bangaii and Flame need to be kept as singles or confirmed pairs, PJ and Yellow Striped might school better)
-Dartfish / Firefish (Dartfish can be kept in multiples, Firefish need confirmed pairs)
