Yes,,at first I did start with getting them as fry,,,both Calvus and Comps. But as we all know these fish take soooo long to grow. Let alone try to figure out if you have a good male to female ratio.
After a year or more,,,I decided that they were taking way to long to grow and pair off. Then I did something I thought I would NEVER do. That was to buy WC.
People tend to think they can determine the sexes of these fish at juvie size?????? It's alot harder IMO,,unless they are at least 2-3.5",,closer to adult size.
I would say that if your going to start with them as fry,,,get more than just a few for a 40. As fry,,you'll never be able to tell if you have any male/female.
If you become impatient like I did. You can get a male to 2-3 female. If you have another male,,the dominant male will take out the other. IME. I am assuming you know about cave and such?
Keep us posted.
APII