Is it going to be a reef? If yes, what type of corals?
For a 50g reef, I like Bangaii cardinals, leopard wrasses (if eating in the store), Kole or Tomini tang, obligatory clown fish, cherub angel, yellow watchman goby, canary wrasse. Fairy & Flasher wrasses will chase each other if males (and males are more colourful for some species) and are notorious carpet surfers (making completely covered tank a necessity).
Less reef-safe (i.e. coral &/or shrimp/hermit-safe) are lemon peel, Eblii or flame angel (whichever one he likes best), flame hawk, long-nose hawk, Marine betta.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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