nice pic!
That is my pair which can be found here:
lyonsi most certainly get over 10". This pair as shown shared this 220gallon aquarium(72x24x30) to themselves.
That pair supplied the hobby with thousands of offspring for 8-9 years. Likely most in the trade currently, originated from that pair. Early last year I was offering 6-8" individuals. of course those are long gone but, up until last month I consistently offered 2-3" juveniles weekly. I still work with the species. They are on hiatus at the moment but I will certainly have more soon.
I've had gorgeous females up to 8" and males at 12". The largest male I've ever seen was the father to the pair in the photo above and the link I provided here in this post. it was in Jeff Rapps hatchery (now mine) for years. it eventually passed a little over 12". it was THICK!
Sadly, no wild stock has been collected of them in many, many years. allegedly some wild stock was collected a few years back but, nothing ever was able to back that up from what I recall. I personally know of two trips to specifically target them that came up empty. in fact one entire body of water was completely gone! I do know that an attempt is being made(as I type this) to locate them. It was thought they have become extinct but, recent sightings have been claimed. so we will see..
These are one of my personal all-time favorite species.