I was unfamiliar with the concept of 'perfect fish' (matching finnage and bodies), until reading some of the posts, above. Based on the 'hint' provided by Brenda, and the first list provided by sfrose, as well as using the 'cleverarts' site extensively (don't have a spreadsheet program)I completed breeding the Twin-fin Arrowfish as well as the Great-Sail Spotanus. I must say that the Great-Sail Spotanus does not appear to match, but Twin-fin Spotanus does. So, now I'm back a step, and have to breed the Hornet Arrowfish. That's okay, it's fun.