Thanks for the sounds info and advice -- My tank is up and running now...just need to wait for the water temp to rise a little more so I can start establishing with some goldfish...won't be long before I add Tilapia...I want the important part of this to go right.

What I'm gathering is that I need to find some good fry and find my own breeding stock from there to be a safe bet. I found a couple of sources, but no response to questions of sterility or hormones...no response to me usually means it's a no go