Not all female betta are dull. Check out this Half-Moon Black Green Lace ( full mask ) female.
Green Black Lace Masked Halfmoon Female. Not all female betta are dull
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A Red Gold Dragon Half-Moon Plakats Female Betta Splendens. Beautiful Specimen.
Red Dragon Halfmoon Plakat Female
This is a female Betta. They don't have nearly the same color or fin length as their more flamboyant male counterparts.