Looks nice just like mine....I also have a F1 Costa Rican. I bought 4 as fry, must have only been free swimmers for a couple weeks would be my guess. I have one male (that I kept) that is about 5" looks exactly like your male a little larger forehead....not a nuchal hump yet but looks like he will have a nice bulge there. Also have a female that is growing extremely slow. Keep us posted on the growth.