no big deal shane... ill second that question too seeing how i have some yellow labs too...*** kept them together before...never had too much of a problem the red zebras a bit aggressive towards them but never had a major problems...lets see what the experts have to say
Adams, are you buying an adult OB zebra or buying a juvenile?
Usually, you cannot tell whether its male or female when they are young. when they are adults, usually the males are a pale orange with a slight blue hue around the edges of their fins, while the females are a deeper orange.
The only sure way to find out though is to vent them.
I purchased an OB Zebra just last week. I was looking to find a male.
The owner of the shop did in fact let me vent on the spot. I looked at three of them that were around 1.5". My close vision is not so good but on the first two I could see the vent.
The third I could not and felt there was a good chance of it being male. Once I got home I photographed it with a macro lens for a better view. Image below.
That said, I don't know if there is a point when they are too small to get an accurate venting even with closeup photography. However I do feel the OB Zebra below is a male.
Below is a Socolofi right at 2" that is an obvious female. This one was traded for a male.