Specifically, a halfmoon betta must have a caudal where both ends are exactly180 degrees apart or more, spreading towards the front.
具体来说，半月斗鱼一定要具备开展朝
，180°
。
鱼Specifically, a halfmoon betta must have a caudal where both ends are exactly180 degrees apart or more, spreading towards the front.
具体来说，半月斗鱼一定要具备开展朝，180°。
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