Join Date: Feb 2014
Location: NY; LETS GO METS
I see a male and a female. What I've come to find is that looking at the anal fin is the best way to sex them as the other traits tend to be muddled and/or difficult to discern.
In the males, the anal fin will meet and/or extend past the joint of the body and tail/caudal fin. In the females the anal fin will not extend past that spot and/or will just barely reach the "joint" of body and tail/caudal.
So, it looks to me that pictures 1,3 and 4 are the male; and in photo 2 the female is on top and the male on the bottom. But, its difficult to tell from the photos. As they grow the male should get larger than the female and the females pink belly should get much more noticeable. I've seen some males that sometimes look like their belly is pink; but its never as drastic as the females.