My babies just turned 8 weeks yesterday, I have one who has been jarred since 6 weeks and he started to make a bubblenest and everything
I now have about 4 boys who are jarred who regularly make bubblenests in their jars everyday.
I have a few (Including girls) that are now halfmoons at eight weeks and a few that are almost there. Right now they are developing their branching so its hard to say what their final spread will be. So I cannot tell you whether or not he will become a halfmoon. Just let him flare regularly! It helps