They are pretty small though. Here is the full size picture and I think the female betta is bigger then they are. This species stays pretty small maxing out at about 3.5 inches.
I have 2 but I can't tell them apart, other then ones stays in the corner most of the time in the fake grape plant area and the other one ventures a bit further away. Suposedly, they seldom venture more then 6 inches away from their turf
Some commons gets so big they cant fit into a 55 gallon and still be able to move around. I've been edumacating myself via a pleco forum. There are so many in so many sizes and colors but the system they use to name them drives me insane. Each species name starts with a L and then they assign it a number, or several numbers like L002