They are generally peaceful but some have been reported to be (just) slightly aggressive. There may be some pecking order in your barbs (as with most schooling fishes), and that specimen may be of lower rank.
What is the tank size anyway? They do better in larger tank sizes, so provide as large a tank as possible.
One other thing is that, this fish can be jumpy, so a lid may be necessary.









WaterH2O
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