A predator tank, hmm. I cannot advise on you that, unfortunately.
However, for a community tank, I could recommend a Marine Betta and a pair of Ocellaris Clowns (these are going to be my staples), a couple of Pajama Cardinalfish (keep them in odd numbers 3, 5, 7 etc.), pretty much all basslets will do (Royal Gramma, Blackcap Basslet, Swissguard Basslet, Swales Basslet, Yellow Assessor, Randall’s / McNeill’s Assessor), some of the more peaceful Hawkfish (Falco, Longnose, Flame-just be careful about putting shrimp or snails), dwarf angels (Coral Beauty, Flame, one of the pygmy angels-African Flameback, Cherub, Brazilian Flameback, Fisher’s etc.), a bunch of gobies and blennies (my favorite is the Yellow Watchman or some other kind of Watchman Goby from the same genus Cryptocentrus), some of the more peaceful damsels of the Chrysiptera genus than can be kept in small groups (Azure, Yellowtail, Talbot’s, Springer’s, Rolland’s).
Not sure about Tangs but maybe a Tomini or Kole Eye Bristletooth or even a Yellow Tang would work?