Maybe i misread your origional post. You said that your males and females from the old colony have been seperated for a while??? How long have they been seperated?

If you are afraid to introduce the old colony males to the old colony females again, and want to add new blood in the mix, then follow my advice.

If you are able to start your old colony breeding again, then follow fraknyvenos advice....

Am I making sense here??? Maybe I should go back to bed!!!