Hooray! Thanks to all the tips from you kind folks, and much searching on CVA site, I now have the 21 "perfect" fish, and the PC version let me keep all of them in the #2 tank, together. In the #1 tank, I now have a breeding pair of each of the seven 'magic fish', with which I am now making much bucks from sales. So, I guess I won twice! Thanks to all - are there any more challenges in this game except to make 'all' the possible fish? Don't think I'll try that one, got where I am with 258 species. I hear there are 441, or more.