you mentioned breeding golden spotanus with orange spotanus. The orange one is something from the common eggs, but the golden spotanus only comes from breeding or rare eggs. I have found that whenever I breed two species from common eggs at low environment levels, I get offspring that last a long while. however, breeding a common fish with an offspring of common fish will always produce something that will not survive. I've built another spreadsheet that shows this pattern, but for Arthur and the gang's sake, will not post it until they say it's ok. (probably when FT2 comes out)