First let me say your girl is a very very pretty thing, see, I love her light color and speckles, makes her unique.
Okay, if you get wc's alot of times they have parasites, mites, worms, and you WOULD NOT want to put them with your cb's.
You would have to keep them seperate for a month or so, treat them and make sure they did not give anything to your cb's.
Also, I am not pushing wild caughts, I want you to know that. They are not as hardy as cb.
They sometimes will not eat or acclimate to captivity, and will literally starve to death. In order to try and keep them alive you must force feed.
They do not tame down like cb, you must work with them, handling alittle each day!
Your better off with healthy parasite free cb's to be honest!
I have wc's, but I'm here all day, have alot of time to devote to problems that wc's sometimes have.
And to answer your other question, No matter how big your tank is only ONE MALE !
You could add 2 - 3 females in a tank that size with the male you have.
But no more males. They are very territorial, and will fight.
Geesh sorry for the BOOK !! LOL 
-----
___
Eve