Thankyou for the info.
I take that back, i've had BOTh the clowns in the tank for about a month now.
How long does it take for a sex change and at what is is physically mature and how long would it take according to my fishs' sizes? If it is going to take too longk, as you said, i will return one for a smaller one.
Here is the pic.
http://www.angelfire.com/ex/s2k-racer/2clowns.JPG