Got to agree with Clearwater as well. The size makes it really difficult to tell as the colors have not developed yet. What can add to confusion is that the process of putting things into digital and then into our computer can change the colors. Each of us is likely to even have different color settings on our monitors.
But since the fish is also likely to be in the process of changing colors, we can miss by a long way.
For those needing to determine the sex of some of the African fish, there can be a way to an answer a bit sooner. I've discovered on my fish I can get the coloring that has not developed fully to show better/sooner.
I use a bright LED flashlight in a somewhat dark tank. As I shine the light on the sides of the fish, my males will show much more blue than the females. Shining the light at an angle makes a blue hue show when you can't normally see it yet.
The female Protomelas and sub-adults are this mousey grey/yellow color. The females stay that color and are not as desirable to buyers.
Getting an early ID on sex of the fish can help when sorting for buyers who want to get one male with several females. Or if you are wanting to stock a tank with young fish and going with the all males setup.
So if the OP wants to net or trap the grey fish near the wall of the tank, it might be possible to see some blue.
But then that may also depend on it being a Protomelas at all!! :crying: