wow it has been a long time since you posted. I still think that you need to wait another year for the size to grow.they usually are sexed at 8-9cm. also need individual shots from above sorry cheers jk :thumbup:
Anything will be most likely an educated guess at the moment so keep feeding them up & doing regular water changes & we will have a look again in a few months
On 7 pics M, F, F, M (alpha male), number 5 unknown as not enough of the fish showing, 6 female (likely to be the first to breed), 7 thinking female although not a complete pic of the whole fish.