As long as you get a pair, they are easy to breed. But they don't always take care of the young. Chances are, if the eggs aren't removed, they will either get eaten, or the eggs will hatch and then when the parents are threatened, the young will get eaten.
If they are small, it's near impossible. Usually the female will stay a bit smaller when full grown. Also, the male will have much longer extentions on the tail, and the pelvic fins will be longer. The extentions on the females tail will be much shorter.
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