I bought eight beani seven weeks ago,I’m down to seven now.This is the dominant one he’s grown about an inch in that time can’t really find any info on sexing them at this size I’m guessing it’s about 3 inches
The fastest growing and largest are usually the males.
Females tend to have a bit of dark color in the dorsal, the males don't, and in males the forehead gets a bit of a pad.
male
female in normal color
below female in spawning color