how old does a dwaf lion have to be to determine male or female?

I believe you can tell right away. Count the number of dark stripes on its pectoral fins. Also if you post a pic in the FOWLR section they will tell you what you have.
 
you can tell at a fairly young age if you have a female or male that isn't in that "cross-over" range (6 dark bands). we have such a fish, and she kept fooling us, but we're certain she's a female now that she's a bit older:

here's a pic showing a female:

caudal.jpg


here's a male (i can't find the pic i'm REALLY looking for):

friendswha700.jpg
 
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