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It is highly recommended to keep them in a larger tank than it appears they need as they really love to zoom around. And definitely, no less than 3. I love this species but haven't gotten them because of space constraints. Some day.
last year i had 5 of them with a male JD, had to rehome them after he killed one. they are very cool fish the way they race around the tank. i was so shocked that the jd was even able to catch 1, non the less kill one.