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I bought a new GBR and not sure if it is male or female.
I currently have a female in the tank. Both were bought from the same store. I bought one Thursday, then had non-buyer's regret and went back to buy the other on Friday. When the new fish joined the female in the tank, she acted very excited and put on a display as if they were previously a mated pair and had been re-united. However, now that "he" has colored up, "he" has a pink tint. As for the fins, its hard to tell but they often look rounded and not pointed. What do you guys think? Here's the best picture I could get of the fish before I added to the tank.
The words on the bag are in the way of a perfect ID
But if they both look pinkish, look at the black spot, in males, the Blue will seem
to stand out over the black, while in a female the blue will be subdued and seem to surround the black. Good luck!
If they have red, they're almost always females. Males have a smooth head where girls have more pointy foreheads. Males usually have a big dorsal spike and no blue dots in their black dot. But just because they do or do not have one of those doesn't mean they're definitely that gender
I've found that the best tell is their bellies. Females will have red bellies and males will not have any red at all. I have a picture of both of mine posted a few posts back (posted on Jan 8 2014) to take a look. Its also in my album.