Just Anecdotal Knowledge, But...
As you probably have learned, fin nipping can cause fungus growth and the unnecessary treatments and expense that goes with it.
Two stunningly-beautiful freshwater fish species I wish I'd had are the Discus and the Betta. (Saltwater fish are said to be "rented and never owned, at least not for long").
If you think he's colorful now, put a female Betta in an adjacent aquarium, and in view of Bennie!
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