It is hard to say still, in my experience male Geos are usually much bigger at all ages than females where as these two are quite similar in size. Though you can get some female cichlids that are unusally male looking. I had a female Severum that looke exactly like a male, all the facial markings, pointy fins, slight thickening on the forehead but she laid eggs pretty much every week - ate them straight away but tried it constantly.
Wills