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No khulis please. Yes they are great and very cool-looking, but they need a much bigger tank than that for a proper school of five, somewhere around twenty gallons. Other than that the rest looks great!
But I have read in many places through research that black kuhlis could live by themselves, but they just enjoy the company of other kuhlis, they don't actually school though. I've had large groups of kuhlis before and they never really stayed togethor