Update: Filamentosis Young
All 6 young fish are well and greet me at the front of the tank for feeding. The brine shrimp and moina are keeping them fat. I always tap the front of the tank just before food time.. it works well to bring them all out for inspection.. and it didn’t take long to train them.
I now suspect there are 4 males and 2 females. Still no strong colors but the males caudal fins are developing nice, The suspect females are very similar in patterns for now, but do also have a less developed caudal ie: more rounded.
The males are occasionaly sparring with each other, especially a more dominant male who keeps his colors darker. They do this in a head down manner and usually clamped fins, except the dominant who will also flare his fins for a full display.