The Double Tail (or "DT") can be seen combined with Plakats, Halfmoons and even Crowntails. It is a genetic trait that causes the caudal fin to grow into two lobes rather than one. The genes that cause this also cause the body to be shorter and the dorsal and anal fins to be very broad. As the body is effectively stunted in length, DT's are more prone to swimbladder problems and this also effects fry survival rates.
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