Bleeding heart tetras

gambit93

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Went out bought two new Bleeding heart tetras last week have spent a week now watching the two and still have no idea if they are male or female. Can anyone out there offer me any clues as to how to determine the sex of this breed?
 
The males are usually slimmer and have a longer, more brightly coloured dorsal fin
 
Thank you, then I think I have two males, I'll turn off the mood lights and stop playing them the romantic music then.
 

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